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So the car only overheats at idle? How many miles on the car? What fan are you referring to - the heater fan or the cooling fan for the radiator? It sounds like you may have a plugged up radiator. If the engine has high mileage the radiator may have accumulated enough junk over the years to become restricted. Some automotive technicians have a laser that they can use to check the radiator for cool spots, which would indicate internal blockage.
SOUND LIKE ENGINE RUNNING HOT.MAKE SURE COOLING FAN TURNING ON. WHILE ENGINE IDLING WATCH TEMP GAUGE AS THE TEMP CLIMB COOLING FAN SUPPOSE TO TURN ON IF NOT.CHECK FAN FUSE AND RELAY. IF BOTH GOOD HOT WIRE IT. NO RUN REPLACE FAN MOTOR IF FAN MOTOR DO RUN. YOU COULD HAVE A FAULTY COOLANT TEMPERATURE SENSOR OR SHORT IN FAN CONNECTOR OR WIRES. CHECK COOLANT LEVEL.MAKE SURE YOU HAVE 50/50 MIXTURE OF WATER AND ANTIFREEZE.TO BE ON SAFE SIDE REPLACE THERMOSTAT AND PRESSURE CAP.
What is the mileage? Check the reservoir for coolant, when the engine is COLD,... I repeat COLD, check the radiator for fluid. If fluid is present, check to see if your fans are working properly, turn your AC on and your fans in front of your motor should kick in within minutes.
If you have coolant in the reservoir and radiator (suspect a new thermostat, replacing the radiator will benefit greatly too)
If your fans do not turn on within minutes, replace your radiator fan relay.
1997 Plymouth Neon, have replaced radiator, radiation cap, thermostate and hoses, still run hot. Fans do not seem to come on, where is the temperature sensor on this vehicle?
I own a 1997 Dodge Neon. My car started to overheat while idling especially with the air conditioning on. We ended up resolving the problem by replacing the fan relay switch which is located under the battery case near the driver's side wheel well. It is a small black square sensor that is approximately 1 1/2 inches across and about a 1/4 inch thick. It was $50 dollars. However, it took us several repairs to figure this out. We first took the fan out and checked to make sure it was working. An easy test is to turn on the A/C and the fan should run if the A/C is turned on. We connected the fan directly to the battery and it worked fine. We then replaced the collant temperature sensor which is located on the engine cylinder on the driver's side under a few hoses, it was difficult to get to. The last option was to pull the PCM computer and replace it which is an expensive option. New PCM's run around $300.00. Ultimately the fan switch relay fixed the problem. Hopefully this helps!
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