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?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Shifter sticking in park

The shift interlock switch on the brake pedal will need to be checked to make sure it is making contact when you press on the brake pedal to release the shift lock. I recommend having a mechanic, like one from...

Q: Showing signs of a blown head gasket.

If there is a head gasket leak, as the engine heats up and expands, that may be sealing the leak somewhat and that would explain your experience. Based on what you are describing, it certainly sounds like a break at...

Q: Cooling fan doesn't turn off

The cooling fan relay is most likely stuck, and needs to be replaced. I recommend that you have a mechanic, such as one from YourMechanic, come by and replace your cooling fan relay, if it is deemed necessary.

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.