My car has been over heating when my AC is off.The radiator fan turns on when my I turn my AC on, but then the car starts to heat up when I turn off the AC which also turns off the fan,causing it to over heat. If your A/C system smells bad check for mildew in the vents or install a new air filter. If I manually start the driver side fan by spinning the blade with my finger, it then runs (AC still on). When the vehicle has the AC on, the engine needs extra help cooling so the ECU commands the fan to be on any time the AC is on. When you turn on the air conditioner in your car, you expect to receive a flow of fresh, cold air.... Over time your car A/C system can start to smell unpleasant. If the compressor is noisy internally, replacing the clutch won't fix your problem. The two engine fans are controlled by separate relays that are turned on by a powertrain control unit. The car has 229,000 miles. After parking the car for 15 20 minutes with ac on its engine temperature goes to half and ac trips and radiator fans are off. Mechanics do not have the necessary field test data, or laboratory data, to wisely specify oil change intervals other than what... Hi there - your RAM pickup should not have a security-enabled key, just a standard non-security key. The AC fan should start when you turn on the AC. Air conditioning serves to remove heat from the inside of your vehicle by circulating a refrigerant through the evaporator core in your dashboard,... Why Does the Air Coming Through My A/C Vents Smell Bad? It's toyota camry 2004 XLE 4 cylinder. If the vehicle overheats, care should be taken when driving to prevent further damage by overheating. When the AC is on the radiator fan works normally. The most likely culprits are a thermostatic switch, fan resistor, temperature switch, low-speed or high-speed relay, or a wiring issue. Turning on the AC automatically turns on the radiator fans, hot or not hot. Toyota Camry 2004 radiator cooling fan only runs a few seconds while AC is on. The temp. When on high, the circuit bypasses the blower resistor. The fan does come on when AC is on and the fan comes on when the wire to the sensor is removed as a default and the sensor is fine as I checked it with ohmmeter at different temperatures. YourMechanic All rights reserved. When exactly this happens is different for different cars. Probably a bad fan switch. 43 Posts . As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem. But the engine fan will come on only when the computer tells it to. When switch off the car and restart all gets fine again. The body control module gets signals from... Hey there. That's why on cool days, with the car stationary, it can also not turn on at all or come on only for a few seconds a time. Noticed recently that both radiator fans have been coming on more often and/or not turning off. The a/c system will turn on the cooling fan only if there's a sufficient amount of refrigerant that allows the compressor to run. 190 Thermostat and coolant temp sensor are new. The fan fuse can be located in either the in-cab fuse box or the under-hood box. © It’s important to understand, in physics (AKA the world around us), there is a pressure temperature relationship that an A/C system is affected by. My car has a manual transmission. The radiator fan switch is located on the thermostat housing and if jumped should operate the fans. thanks for help!! The first problem on my ZETEC 2.0 is it always would have the highest speed fan come on when I turn on the AC but no low speed fan in car will run a temperature now that I've changed the pigtails and resistor the low speed fan comes on only when the AC is on but no highest speed fan and still no fan at all when the car's AC is not on any help with this problem with you really appreciated guys The faster the car warms up the faster the Cat converter starts working. Broken or shorter signal wire Is the Cooling Fan Relay operating? Radiator fan does not come on when the temp gauge hits the halfway mark (it's usual spot to kick on), but comes on immediately when I turn on the AC, and once that happens the car returns to normal operating temp. If I don't turn on the AC, the temperature spikes to the yellow area. 64 Posts . The faster the engine is running the faster the fan will spin. Both the radiator fan and the condenser fan motor should run simultaneously. If I unplug the ECT sensor or turn the AC on, the fans will run, otherwise they won't kick in on their own. Fans kick on when AC is turned on. Please see our. Yes Have a 2004 WRX w/about 133,000 miles on it. Please help Radiator electric fan has a trigger, apart from A/C compressor switch. document.write(new Date().getFullYear()) From the fuel pump to the engine, the lines run along the underside of your car. RADIATOR FAN CONTROL RELAY OPERATION NOTE: When actuating the radiator fan relays, the Radiator Fan(s) may have a delay in operation and ramp up slowly. Most likely the temperature sensor that operates the fan under normal circumstances is faulty. Historically the temperature is in the middle of the temperature gage. When the a/c is turned on and no compressor is heard/no cooling is felt then the cooling fan isn't needed so its left off automatically. The most likely culprits are a thermostatic switch, fan resistor, temperature switch, low-speed or high-speed relay, or a wiring issue. This unit spins when the engine is running, and it always spins at the same rate as the engine. Please advice. well when my car is parked and i don't have the ac on the engine starts raising the temperature above the normal but when i turn on the ac starts dropping and if i turn the ac off the fans starts working just fine. One note on the fans. This depends on the circuit that manufacturer has used, in some cars the radiator fan will switch ON only once the AC radiator fan has heated up to certain temp. guides, Check cars for recalls, common issues & maintenance Radiator fan does not come on when the temp gauge hits the halfway mark (it's usual spot to kick on), but comes on immediately when I turn on the AC, and once that happens the car returns to normal operating temp. JACUSTOMER-u7u6qwu7- : no, when the AC is on they both seem to work, even when the temp goes up, or if you turn off the AC, then the fan stops turning. Also the Fan may be on continuously when the AC is operating. In other words, if the compressor runs the fan runs. 2003 Acura RSX Type-S. Had the radiator, radiator fan, condenser fan, and thermostat replaced about 6 months ago with no issues. 2 Answers. Engine runs correct temp while air flows through radiator at highway speed or when AC is turned on (thus fan is on). I plan to investigate my fans when I have it all back together. You will need to see if you are loosing fuel pressure due to a bad fuel pump or you are loosing spark due to a bad sensor or coil pack. I decided not to use the AC yesterday and the temperature gauge rose up. 18 September, 2019 Reply . 3. The fuel pump on your vehicle mounts underneath your back seat. Your back seat switch was bad, even though the fan is on radiator! 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Fan might be the culprit if the vehicle overheats, care should be taken when driving to further.