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.

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?
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. Car gets too hot before the fans come on.

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: Where is the Coolant Temperature Sensor located?

Coolant temperature sensor is located at the upper radiator hose where it connects to the engine. Should be a green plug connector just to the left of the hose.

Q: Electric fan sounds like a jet.

Your vehicle has two separate cooling fans. One is for low and medium speeds. The other one is high speed only. Your vehicle has two separate circuits and only the high speed is working or your vehicle is running hot...

Q: 2007 Honda Accord v6 won't start or even click when key turned.

Hi There, This may be caused by a number of things, but commonly this is a result of a faulty connection at the battery or in many cases, a faulty starter relay. The starter relay directs power from the battery...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...