Q: Q: Overheating

asked by on

My car is still overheating after I took my radiator to get it checked (it was good), I replace the cooling fan switch, the ECT, the thermostat, the water pump, the fans WILL only turn on with the a/c and the fan relay is good... head gaskets seem to be good since there is no water on oil or oil in water...what else can it be?

My car has 196000 miles.
My car has an automatic transmission.

Hello and thanks for your question. The problem with your vehicle lies within the wiring from the ECT and the cooling fans. You mentioned that the cooling fans only come on when the A/C switch is on. This is because the A/C circuit has a different setup with the cooling fans.

There is a separate circuit for engine management cooling. Check the plug on the cooling fans for any broken pins or corrosion and then trace the wires to the ECT and check the connections for any broken pins or corrosion. It is possible that the wiring harness could have a break in it.

Also, the fan motor could have a burned wire on the motor itself. If there are two fans, check to see which fan comes on when the A/C is on. If only one fan comes on, then the other fan could be burned up. Remove the harness to the fan that is not working and check the resistance on the terminals. If the resistance is high, the the fan motor is burned up. I recommend seeking out a professional, as one from Your Mechanic, to help you determine why the car is overheating.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Overheating

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why does my check engine light come on when it's close to getting an oil change

Hi there. In most cases, a service engine light will be illuminated on the dashboard when routine service and maintenance is required. The Service (or Service Engine) light is a warning light that is connected to the engine control unit...

Q: Q: Catalytic converter replacement.

This would depend on the code that is retrieved from the check engine light. It never hurts to get a second opinion. I would recommend having another technician, such as one from YourMechanic, come to scan your vehicle for trouble...

Q: Are these GM OEM Parts?

Hello. If the A/C is not functioning on your vehicle then it can be caused by any number of parts. It can be low refrigerant, a bad compressor, a fan, or any number of other things. Whatever the issue is,...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.