Skip the auto shop - Our mechanics make house calls

Q: Car gets too hot before the fans come on.

asked by on

My car was overheating while idling, but would cool down when driving. Replaced the cooling fan switch and the thermostat, so now the fans turn on. But, now the fans don't come on until the car is way too hot to cool down. I've recently refilled my fluid in the radiator, and I've noticed no leaks in the radiator our hoses. Can you tell me what my next step should be?

My car has 156000 miles.
My car has an automatic transmission.

A: This is a common sign of a faulty coolant t...

This is a common sign of a faulty coolant temperature relay. This is a relay that monitors the temperature of the coolant and relays this information back to the computer which then uses this information to make many different decisions regarding functions of the engine. When this sensor is not working properly, this may cause inaccurate readings to be supplied to the computer which causes a bit of a chain reaction in terms of the various other functions that are affected by this. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your coolant temperature sensor.

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

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: The temperature gauge is almost in the red zone immediately after driving car.

Hello, thanks for writing in. There is definitely something wrong with your cooling system. If the coolant level is fine then it may be a failing thermostat or water pump causing the coolant not to flow through the engine. These...

Q: Steering wheel adjustment

Hi, thanks for writing in. I think what you are experiencing is the crown of the road. I would recommend returning to the shop who has been aligning your vehicle, and have them compensate for the crown of the road....

Q: The door striker plate fell inside the car, how do I get it out?

You can try fishing out the bracket with an extendable magnet. There was a threaded washer that attached the door striker plate to the shell of the cab. If the magnet is not working, then try a telescoping tool and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.