Skip the auto shop - Our mechanics make house calls

Q: Overheating, no leaks, replaced thermostat, fan clutch, radiator.

asked by on

My car overheats after driving a few miles now, used to go longer before. No leaks. I have heat and AC fine. I replaced the radiator, fan clutch, and thermostat. Oil change done. Coolant is full and clear. If i turn the heat on the temp drops. I made it 4 hrs nonstop with the heat on and driving even. If its idling, no overheat. Cant use the ac or it does overheat. I did the gasket pressure test. Water pump or control valve???

My car has 146000 miles.
My car has an automatic transmission.

The water pump is a possibility although when water pumps fail they usually leak or make noise. It is more likely that there is a restriction of some kind in the cooling system. Since the radiator has been replaced, the restriction likely lies within the engine itself. A good power flush may resolve this issue as there may be some gunk built up inside the engine. You may also have air in the system that needs to be bled out. Many vehicles have a bleeder valve somewhere that will allow you to do this.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

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 do my 2002 infiniti temperture rise quickly once started i've changed the thermostat,and the fan @clutch

Hello, and thank you for writing in. With the repairs that you have already made, you may want to turn your attention to the water pump and the radiator. Make sure after the fan clutch replacement that the fans are...

Q: My Pontiac G6 won't crank and wont start

I believe your "no crank" issue is the passlock security system has locked things down because of what it perceived as a "battery swap". If the car restarted after the jump as you indicate, the ECM is probably OK. The...

Q: Problems filling up my car.

The fuel inlet hose into the fuel tank has a vent system that if it gets blocked for some reason would not allow fuel to be put in too fast. The vent system would have to be checked for obstructions...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.