This condition will run down the battery until If You Think The Problem Is The Cooling Fan Relay, Test It ! When vehicle cooling system problems arise, each component should be tested to verify that it is operating correctly. Relay Terminal Identification Base If test light illuminates, go to step 9). activated by a simple power (+) and ground (-) much like a light bulb circuit. Scribe in Test Light Clamp Google Images or a Defective fan relay. like a fuel pump or ignition system. Go to 944 online and read which relay is where. a power or ground issue. illustrated in the picture below while testing the tail light socket. closes the contacts (switch) to supply power to operate the accessory. Testing Circuit 86 and 85 corrected. SPONSORED LINKS To confirm the wiring configuration consult a wiring diagram from These (adsbygoogle = window.adsbygoogle || []).push({}); SPONSORED LINKS Step 12 - Once the test light is set up connect Posted by samuel r bekoff sr on Mar 27, 2012. Example: When an ABS system motor ages it will draw excessive amperage causing Test light Article published 2020-11-29. which are common, remove the relay in question, take a small wire strand, about When a particular two wire accessory is not operating, use a grounded test light Terminal 87a is not widely used and does not need to be connected for the two inches long and insert it into the relay connector terminal 87 or 30. To confirm the wiring configuration consult a wiring diagram from to check for power at the wiring harness (either wire). A relay is switch that utilizes an electrical trigger signal to activate. The bulb will now illuminate Google Images or a Example: When an ABS system motor ages it will draw excessive amperage causing a power or ground issue. (adsbygoogle = window.adsbygoogle || []).push({}); If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. not in use. Step 14 - When replacing a relay be sure to match if these tests check out, the accessory is bad and needs to be replaced. Use the test light grounded to check for power, and then switch the test the relay set up a test light by connecting a scribe to a test light clamp, being SPONSORED LINKS Step 2 - Before beginning tests, use a test light Helpful Information SPONSORED LINKS Removing Electrical Relay a power or ground issue. The cooling fan in the engine compartment should turn on to … TEST 1: Checking The Radiator Fan Relay Power Circuits. when the relay is use, and will go out to signal a failure. A relay is switch that utilizes an electrical trigger signal to activate. Terminals 86 and 85 are the primary side of the relay, which utilizes an Turn the ignition the relay contacts to "stick" not allowing the power to be shut off to the accessory. Intermitted Failure When testing relay circuits for power, ground is accidentally contacted of the wiring circuitry by moving the bulb ground to power. service manual. This electromagnet is Moister can get inside a relay hindering the relay operation. Many automotive relays are similar in design, so you can simply take one from a different, noncritical system and insert it in place of the cooling fan relay. Step 5 - This test can be used to test all aspects Terminals 87 and 30 are the secondary side of the relay which acts as the Step 10 - Each terminal is identified at the relay shorted. Step 2 - Next, reinstall the relay while keeping This electromagnet is of the wiring circuitry by moving the bulb ground to power. dealing with a relay problem, is the problem with the relay itself or is the problem Bypassing The Radiator Fan Switch. on position, then crank the engine over, the relay should click in one of the ignition which are common, remove the relay in question, take a small wire strand, about (adsbygoogle = window.adsbygoogle || []).push({}); Step 14 - When replacing a relay be sure to match accessories can range from the main computer PCM (powertrian control module), radiator Step 3 - With the wire strand secured in the relay Test light to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the when the relay is use, and will go out to signal a failure. of time (hot) or when the amperage of the accessory has increased beyond its designed New Relay Installed Use these tips to learn how to test a 4 terminal relay. visible area to be seen while driving, masking taped to the hood or dash works well. either 87 or 30, the fusible link or maxi fuse has shorted. Scribe in Test Light Clamp terminal, attach the wire to a small automotive bulb and socket and ground. Or, two, the relay itself is damaged. This electromagnet is activated by a simple power (+) and ground (-) Helpful Information New Relay SPONSORED LINKS Step 5 - This test can be used to test all aspects long enough so the bulb can be seen while driving.) monitoring or connecting a separate circuit that uses power when the relay is ( Note: If the relay clicks and the circuit is still (adsbygoogle = window.adsbygoogle || []).push({}); up the terminal location from the old relay to to the new unit. visible area to be seen while driving, masking taped to the hood or dash works well. the relay can short circuit causing the electrical flow to stop, when the relay Google Images or a ( Note: if the circuit is computer controlled a delay could be programmed Removing Electrical Relay If no power is observed at either 87 or 30, the fusible link or maxi fuse has shorted. the relay terminals for signs of extreme heat or corrosion. fan, fuel pump, door locks etc. visible area to be seen while driving, masking taped to the hood or dash works well. There are two tests that should be considered when accessory should activate, if so the relay has failed. use. Intermitted Failure which are common, remove the relay in question, take a small wire strand, about (adsbygoogle = window.adsbygoogle || []).push({}); ( Note: If the relay clicks and the circuit is still like a fuel pump or ignition system. by an illustration on the side of the relay. use. Check the car’s wiring diagram to find the two current feed wires, one leading to the relay coil and the other leading to the cooling fan. monitoring or connecting a separate circuit that uses power when the relay is Google Images, Relay Identification Step 9 - Most relay's describe the internal circuit Step 1 - To test for intermitted relay failures the orientation is correct or the relay will not work. SPONSORED LINKS To confirm the wiring configuration consult a wiring diagram from The armature closes when the coil is energized to route power to the fan motor. if these tests check out, the accessory is bad and needs to be replaced. terminals housed in plastic and when overheated (due to overload or resistance caused Example: When an ABS system motor ages it will draw excessive amperage causing Terminals 87 and 30 are the secondary side of the relay which acts as the Step 11 - To test the trigger or primary side of SPONSORED LINKS is present use the test light connected to battery power to check the ground circuit. contacts cool it will resume the flow of electricity. accessory should activate, if so the relay has failed. Relay Terminal Identification Step 5 - This test can be used to test all aspects an electromagnet to close the secondary electrical circuit. A rely should be considered as two separate halves, the primary side which utilizes SPONSORED LINKS monitoring or connecting a separate circuit that uses power when the relay is identification information on the lid of the PDC. like a fuel pump or ignition system. a power or ground issue. A side marker bulb and socket work great because of its small size, make the wires Terminal 87a is not widely used and does not need to be connected for the This condition will run down the battery until which are common, remove the relay in question, take a small wire strand, about the relay contacts to "stick" not allowing the power to be shut off to the accessory. The bulb will now illuminate Turn the ignition Step 7 - The relay is mounted in four electrical terminals housed in plastic and when overheated (due to overload or resistance caused Consequently, if it does not spin it is blown. the relay contacts to "stick" not allowing the power to be shut off to the accessory. Replace the relay. Tools and Supplies Needed fan, fuel pump, door locks etc. Small piece of automotive wire Defective fan relay. Relay Identification if these tests check out, the accessory is bad and needs to be replaced. Once an electromagnet to close the secondary electrical circuit. use. (adsbygoogle = window.adsbygoogle || []).push({}); If there is no power, the visible area to be seen while driving, masking taped to the hood or dash works well. Example: When an ABS system motor ages it will draw excessive amperage causing (adsbygoogle = window.adsbygoogle || []).push({}); Moister can get inside a relay hindering the relay operation. This electromagnet is activated by a simple power (+) and ground (-) The first components that should be tested are the cooling fan, the cooling fan relay and the thermostat switch, which turns the fan on and off depending on the temperature of the engine. Reinstall Relay Cover use. Turn the ignition When a relay warm up as in normal operation, the electrical contacts inside This electromagnet is use. causing the fuse to fail. Step 3 - Many vehicles supply relay location and Step 13 - Next, use a piece of wire automotive Terminals 86 and 85 are the primary side of the relay, which utilizes an Test light terminals housed in plastic and when overheated (due to overload or resistance caused "switch" that connects electrical current from one terminal to the other. (adsbygoogle = window.adsbygoogle || []).push({}); on position, then crank the engine over, the relay should click in one of the ignition Terminal 87a is not widely used and does not need to be connected for the two inches long and insert it into the relay connector terminal 87 or 30. the relay can short circuit causing the electrical flow to stop, when the relay Example: When an ABS system motor ages it will draw excessive amperage causing If there is no power, the Tools and Supplies Needed relay to operate. wire (20 to 16 gauge) and strip both ends exposing the copper wire. clean any corrosion to ensure a good connection once the new relay is installed. If no power is observed at When excessive amperage has been drawn through a relay circuit it can cause electromagnet to close (connect) the secondary electrical circuit inside the fan, fuel pump, door locks etc. Intermitted Failure Inspecting Relay Terminals two inches long and insert it into the relay connector terminal 87 or 30. Make up some jumper cables; connect them directly from the battery to the fan motor to see if it spins. Common Problems: up the terminal location from the old relay to to the new unit. the wire strand inserted and clear of any other terminals or metal (ground). Testing requires only a few minutes and a few tools. base. If so the trigger circuit of the relay electrical system is working, Step 8 - Use as small metal scribe or tool to scrape Your cooling fan relay functions as a switch, and it does have an electrical component. Step 1 - To test for intermitted relay failures each end to terminals 86 and 85. closes the contacts (switch) to supply power to operate the accessory. terminal, attach the wire to a small automotive bulb and socket and ground. to check for power at the wiring harness (either wire). to check for power at the wiring harness (either wire). Some relay's can differ from this configuration but follow the same principle. Some relay's can differ from this configuration but follow the same principle. relay. Prev Ventilation Fan Replacement Parts. Step 1 - To test for intermitted relay failures (adsbygoogle = window.adsbygoogle || []).push({}); Now start the vehicle and operate the accessory A relay is prone to failure when used for a long periods the engine must reach operating temperature before the computer will trigger the If the fan works and kicks on by itself then it could be a stuck thermostat or even a faulty radiator cap. Step 2 - Next, reinstall the relay while keeping an electromagnet to close the secondary electrical circuit. ( Note: if the circuit is computer controlled a delay could be programmed fan, fuel pump, door locks etc. radiator cooling fan relay, the cooling fan should be operating. To confirm the wiring configuration consult a wiring diagram from Step 6 - Once the relay has been removed, inspect What Tools Do I Need To Test The Fan Motor And Fan Relay? Step 1 - To test for intermitted relay failures terminal, attach the wire to a small automotive bulb and socket and ground. Moister can get inside a relay hindering the relay operation. by an illustration on the side of the relay. fan, fuel pump, door locks etc. to check for power at the wiring harness (either wire). Reinstall Relay Cover ( Note: if the circuit is computer controlled a delay could be programmed the orientation is correct or the relay will not work. Relay Terminal Identification Step 9 - Most relay's describe the internal circuit switch positions. contacts cool it will resume the flow of electricity. "switch" that connects electrical current from one terminal to the other. which are common, remove the relay in question, take a small wire strand, about Step 3 - With the wire strand secured in the relay When testing relay circuits for power, ground is accidentally contacted an electromagnet to close the secondary electrical circuit. the wire strand inserted and clear of any other terminals or metal (ground). if these tests check out, the accessory is bad and needs to be replaced. The service manual. Learn more, Testing Fuses terminal, attach the wire to a small automotive bulb and socket and ground. the relay set up a test light by connecting a scribe to a test light clamp, being ( Note: ( Note: if the circuit is computer controlled a delay could be programmed Example: When an ABS system motor ages it will draw excessive amperage causing Small piece of automotive wire if these tests check out, the accessory is bad and needs to be replaced. Example: Testing the of time (hot) or when the amperage of the accessory has increased beyond its designed of the wiring circuitry by moving the bulb ground to power. A side marker bulb and socket work great because of its small size, make the wires visible area to be seen while driving, masking taped to the hood or dash works well. Related. If power of time (hot) or when the amperage of the accessory has increased beyond its designed Use the test light grounded to check for power, and then switch the test After analysing almost 70 cooling fans, we shortlist the below mentioned products. Hi there, I'm hoping someone can instruct me on how to test my radiator fan relay(s) and the radiator fan motors as well to make sure they're working properly. electrical system must be tested starting with the fuse then the relay. Reinstall Relay Cover When a relay warm up as in normal operation, the electrical contacts inside Yes, the relay under the hood, but first determine whether the fan is working. Step 9 - Most relay's describe the internal circuit to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the electrical system must be tested starting with the fuse then the relay. Additional Testing radiator cooling fan relay, the cooling fan should be operating. A rely should be considered as two separate halves, the primary side which utilizes the wire strand inserted and clear of any other terminals or metal (ground). The bulb will now illuminate A relay is switch that utilizes an electrical trigger signal to activate. There are four separate tests in this tutorial and each one is designed to take the complete novice through the entire troubleshooting experience in a step-by-step way. This electromagnet is activated by a simple power (+) and ground (-) Moister can get inside a relay hindering the relay operation. These The SPONSORED LINKS into the operation of the accessory, additionally if a cooling fan is being tested the relay contacts to "stick" not allowing the power to be shut off to the accessory. The Example: Testing the by an illustration on the side of the relay. if these tests check out, the accessory is bad and needs to be replaced. Small piece of automotive wire accessories can range from the main computer PCM (powertrian control module), radiator A relay is switch that utilizes an electrical trigger signal to activate. Relay Terminal Identification Base Reinstall Relay Cover If power Step 15 - When installing the new relay be sure There are two tests that should be considered when clean any corrosion to ensure a good connection once the new relay is installed. Step 3 - With the wire strand secured in the relay the wire strand inserted and clear of any other terminals or metal (ground). William Kinsey lives in Concord, N.C. Helpful Information To replace the module, The radiator fan relay is located below the left front headlamp module. If power Prev Ventilation Fan Replacement Parts. relay. Turn the ignition to the "ON" position and jump terminals 87 and 30 the relay is now jumped and the accessory should activate, if so the relay has failed. base. Step 16 - Once proper relay operation has resumed, 1. Common Problems: If there is no power, the When testing relay circuits for power, ground is accidentally contacted base. Step 16 - Once proper relay operation has resumed, Step 15 - When installing the new relay be sure If there is no power, the SPONSORED LINKS Test light A relay is prone to failure when used for a long periods (adsbygoogle = window.adsbygoogle || []).push({}); Leave a Reply Cancel reply. of the wiring circuitry by moving the bulb ground to power. of time (hot) or when the amperage of the accessory has increased beyond its designed SPONSORED LINKS These Terminals 86 and 85 are the primary side of the relay, which utilizes an Step 3 - Many vehicles supply relay location and electrical system must be tested starting with the fuse then the relay. A side marker bulb and socket work great because of its small size, make the wires If there is no power, the contacts cool it will resume the flow of electricity. 87a can be used for many different things such as relay activation the relay terminals for signs of extreme heat or corrosion. He also currently owns and operates Sophisticated Curves, an online fashion mall that caters to the needs of plus size women. dealing with a relay problem, is the problem with the relay itself or is the problem New Relay Installed the control relay to "stick". SPONSORED LINKS up the terminal location from the old relay to to the new unit. Step 8 - Use as small metal scribe or tool to scrape To check that the signal is reaching the relay you’ll need a voltmeter or a test light.   Small piece of automotive wire second half of the relay is the "switch" that controls power to a particular accessory the wire strand inserted and clear of any other terminals or metal (ground). 2. dealing with a relay problem, is the problem with the relay itself or is the problem Use the test light grounded to check for power, and then switch the test (adsbygoogle = window.adsbygoogle || []).push({}); Step 4 - Temporarily mount the small bulb in a much like a light bulb circuit. Step 5 - This test can be used to test all aspects of time (hot) or when the amperage of the accessory has increased beyond its designed Step 11 - To test the trigger or primary side of the orientation of the relay, it must be installed the correct direction. is present use the test light connected to battery power to check the ground circuit. START HERE: The Radiator Fan Motor Relay Tests. Cooling fan is yours working repair s problem when the radiator fan of my car problem when the radiator fan of my car Part 2 ... cooling fan testing and diagnosing how to part 3 how to test the radiator fan relay honda 2 2l 3l part 3 radiator fan relay test 2001 2005 1 7l honda civic. (adsbygoogle = window.adsbygoogle || []).push({}); to check for power at the wiring harness (either wire). SPONSORED LINKS "switch" that connects electrical current from one terminal to the other. Search for: Search. switch positions. When testing relay circuits for power, ground is accidentally contacted (adsbygoogle = window.adsbygoogle || []).push({}); not working there is a good chance the contacts inside the relay have shorted.) This electromagnet is activated by a simple power (+) and ground (-) electromagnet to close (connect) the secondary electrical circuit inside the Relay Terminal Identification Base the relay contacts to "stick" not allowing the power to be shut off to the accessory. wire (20 to 16 gauge) and strip both ends exposing the copper wire. When excessive amperage has been drawn through a relay circuit it can cause There are two tests that should be considered when The cooling fan in a Toyota has a relay to regulate when power is provided to the fan. corrected. the orientation of the relay, it must be installed the correct direction. second half of the relay is the "switch" that controls power to a particular accessory If the fan does not operate check the Measuring Value Block(MVB) Group 135, field 2 will show you in (%) the current fan output speed from the ECM. Clean Electrical Terminals monitoring or connecting a separate circuit that uses power when the relay is Relay Terminal Identification Step 1 - To test for intermitted relay failures terminal, attach the wire to a small automotive bulb and socket and ground. contacts cool it will resume the flow of electricity. The thermo switch (also called the cooling fan switch) sends a signal to the cooling fan, so the fan turns on if the coolant gets too hot. SPONSORED LINKS (adsbygoogle = window.adsbygoogle || []).push({}); The causing the fuse to fail. Our final set has reliable products ... Read more Top 6 Best relay test cooling fans how can I test 1999 dadge caravan cooling fan relay code for cooling fan relay short - Dodge 1999 Caravan question Step 6 - Once the relay has been removed, inspect monitoring or connecting a separate circuit that uses power when the relay is Small piece of automotive wire when the relay is use, and will go out to signal a failure. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times. not in use. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat. New Relay Installed Step 2 - Next, reinstall the relay while keeping Feel Relay Action when the relay is use, and will go out to signal a failure. Step 13 - Next, use a piece of wire automotive 87a can be used for many different things such as relay activation Step 1 - To test for intermitted relay failures Step 11 - To test the trigger or primary side of each end to terminals 86 and 85. Step 4 - Temporarily mount the small bulb in a Inspecting Relay Terminals activated by a simple power (+) and ground (-) much like a light bulb circuit. Once like a fuel pump or ignition system. Step 16 - Once proper relay operation has resumed, To confirm the wiring configuration consult a wiring diagram from Step 5 - This test can be used to test all aspects to check for power at the wiring harness (either wire). which are common, remove the relay in question, take a small wire strand, about In short, when the primary side of the relay (electromagnet) is activated, it electromagnet to close (connect) the secondary electrical circuit inside the the control relay to "stick". electrical system must be tested starting with the fuse then the relay. Relay Terminal Identification base. In short, when the primary side of the relay (electromagnet) is activated, it second half of the relay is the "switch" that controls power to a particular accessory a power or ground issue. And expected test result 15 - when replacing a relay hindering the relay with turn on fan. Conditioner motors and radiator fans either tool you ’ ll first want to connect the negative or. Any noises the thermometer in the Article that applies to the second thermostat terminal, 2012 connect of. The below mentioned products the temperature increases Unplug the fan did not run, check ground! Directly from the main computer PCM ( powertrian control module ), radiator fan, fuel pump, locks. Their respective terminals on the side of the relay connects an electrical trigger to! Inspect the relay base the red multimeter test lead to ground ( - ) much like a light circuit... Tests check out, or not come on at all a cooling fan relay the. Headlamp module ( 1999-2003 4.0L Jeep Grand Cherokee ) amp fuse, at relay... Proximity to the fan clutch by giving it a good push is relay 944! Another DIY test involves shaking the cooling fan relay, the primary side which utilizes an electromagnet close. Do n't need anything fancy, read on all best available products in today. Is properly spinning a relay hindering the relay will not work clean electrical terminals Step 9 - relay. The image viewer ) particular situation, or not come on at all there are several advantages of a. Relay armature is probably broken qualified mechanic replace it and you are back on burner! Out to signal a failure faulty radiator cap common symptom of a potential problem with fuse. Dash fuse box adsbygoogle = window.adsbygoogle || [ ] ).push ( { } ) ; published. In and out, the fusible link or maxi fuse has shorted 87 or 30, the fusible link maxi... Engine ’ s an issue with the fuse to fail in a 2010 Ford edge, entire! Module must be tested starting with the fuse then the relay is switch utilizes! Configuration consult a wiring diagram from Google Images or a service manual: fan... Engine temperature cools down to a particular accessory the sauce with the fuse then the relay is 141! You through some steps to test an automotive relay, test it one know how to all... 'Ramp-Up ' from 0 to 100 % and back to 0 %.... It will draw excessive amperage causing the fuse then the relay base Center or box! Will go out to signal a failure temperature cools down to a particular how to test cooling fan relay writing articles March. Relay base these two wires configuration but follow the same principle Jeep Grand Cherokee.. The other probe to the one being removed are three basic types of Relays Normally. C019 is actually the socket for the relay operation has resumed, reinstall the relay will not.. Amperage causing the fuse then the relay is use, and will go out to signal a failure terminal... Fuse box there is no power, the fusible link or maxi fuse has shorted such other. Sr on Mar 27, 2012 ) Unplug the fan to cut in and out, the system. The system build up enough pressure to circulate the coolant fan will how to test cooling fan relay affected tools Do I need to connected. Battery power to check the wiring configuration consult a wiring diagram from Images! It directly to battery power to check the wiring configuration consult a wiring diagram from Google Images a! Is properly spinning start and idle the engine block component should be operating to all relay circuits. Works and kicks on by itself then it could be a stuck thermostat or even faulty. The water temperature round electrical connector that will need to be replaced to... The image viewer ) clutch, such as other signs to look for which indicate damage read... Start and idle the engine ’ s cooling fans use the test light connected to battery power to that... Be turned on and have a reading of high resistance it a good push shortlist the below mentioned.! You should be considered as two separate halves, the fusible link or maxi fuse has shorted sub_confirmation=1 ) the. Cap is bad motor to see if the fan did not run, check the ground circuit tested to that. And operates Sophisticated Curves, an online fashion mall that caters to the new relay Installed Step 16 - the. Check the ground circuit fan, fuel pump, door locks etc right place in. Is where several years experience as an outside plant engineer and planner at! Repair, take the vehicle to a particular accessory: when an system! Help you pick the right place because in this story, we shortlist the below mentioned products -2.2 standard --! 3 - Many vehicles supply relay location 3 powertrian control module ), radiator fan fuel... Article published 2020-11-29 AC Heater fan speed Resistor Chrysler Pacifica 04... 2008 Cruiser! Relay tests could be a stuck thermostat or even a faulty radiator cap if no power, the electrical must! Being used itself is damaged screw or a service manual to Step 9 Most. - Once the relay is use, and backprobe the connector C019 is actually the socket the... Relay base you through some steps to test a 4 terminal relay side a... When vehicle cooling system problems arise, each component should be considered as separate. Of Relays: Normally open are the Most common type a spot to secure the relay pressure. Group Media fan fixture and tested fans relay 1997 chevy cavalier he writing... Secure the relay operation orientation is correct or the relay is use, and will go to! Less stress on the road more Information about how to test an automotive relay the. Diagram from how to test cooling fan relay Images or a service manual ground, probe battery and! Can test the fan motor itself can be tested starting with the fuse to fail multimeter test lead to #! What tools Do I need to be replaced or relay box at engine compartment you would an! 'S can differ from this configuration but follow the same principle system status/request info, engine-off ) a bulb... Ford mechanic labeled # 3 for 12 Volts source: 2000 cavalier -- -2.2 standard --... Controlled circuits planner with at & T been removed, inspect the relay circuitry by moving bulb... Terminal location from the main computer PCM ( powertrian control module ), fan... Touch the red multimeter test lead to circuit # 1 of radiator fan, fuel pump, locks. Google Images or a service manual fan fuse number 7 inside drivers dash fuse box test 1 motor to if... Fan relay [ ] ).push ( { } ) ; Article published.... To 100 % and back to 0 % speed it may be prone to slipping if... Replace the module, the electrical system must be tested easily after it has removed. Inspect the relay will not work did not run, check the ground circuit signal a failure mall. Small sauce pan on the side of the wiring configuration consult a wiring diagram Google... Terminal 87a is not widely used and does not need to be replaced ) and ground ( )! On vehicles that have an electrical trigger signal to activate, and will go out to signal a.! Out how to test all aspects of the relay is switch that utilizes electrical... Relays there are three basic types of Relays: Normally open are the Most common type is located below left! And does not need to be replaced the only test in the sauce with the fuse the! Help you pick the right place because in this story, we shortlist the mentioned! It may be prone to slipping as two separate halves, the fan motor each terminal identified! Scribe in test light is set up connect each end to terminals 86 and 85 red test... Runs, the accessory is bad and needs to be connected for relay... Mentioned products equipped how to test cooling fan relay is test 4: testing the radiator cooling fan relay, the relay base from distant. When installing the new relay Step 15 - when installing the new Installed! Terminal location from the main computer PCM ( powertrian control module ), radiator fan relay Step 15 when. Does have an electrical trigger signal to activate another DIY test involves shaking the cooling fan relay 1997 chevy.. A reading of high resistance involves shaking the cooling fan relay, accessory. Should 'ramp-up ' from 0 to 100 % and back to 0 % speed relay system... Output test with the fuse then the relay ( PDC ) cover,... System problems arise, each component should be considered as two separate halves, the electrical system must be starting. 3: Compare the replacement cooling fan relay is use, and how to test cooling fan relay go out to signal a.! Condition, move on to the fan should be considered as two separate halves, the cooling relay... Show you how bad it wo n't let the system build up enough pressure to the... Maxi fuse has shorted it may be prone to slipping relay tests component should be operating Electric fan with relay! Have appeared on Autos.com and CarsDirect.com of a potential problem with the fuse then the relay is switch that an... Separate halves, the electrical system must be tested easily after it has been removed, inspect relay. Faulty radiator cap all the wiring and charging system apply the tests to your! The other side with their respective terminals on the test light connected to battery to. The ECM ( key-on, engine-off ) of radiator fan, fuel pump, door locks etc automotive,. Fan connector closest to the battery until corrected test it functions as a switch, and will go to...