Skip the auto shop - Our mechanics make house calls

Q: Fan runs when car is off. Overheats when idling for a 3-minute period

asked by on

Fan will stay on for a few minutes when car is off. Heat will only work when traveling at 60 mph, otherwise it blows cold. Temp gauge reads hot when car is idle for a few mins, only when temp is warmer outside. Thermostat was replaced same issues.

My car has 94000 miles.
My car has an automatic transmission.

Hey there. This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know, the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the fans to come on intermittently, all the time or sometimes not at all. When this happens you will notice a temperature spike and drop occasionally as the fan comes on and off. I would suggest having an expert from YourMechanic come to your home to diagnose the overheating problem and guide you through any needed repairs.

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
  • Home
  • Questions
  • Fan runs when car is off. Overheats when idling for a 3-minute period

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: Check engine light

Although, there is no definitive way to say those are related, it is quite possibly and likely that they may be related. When the O2 sensor is not working properly, it may cause the system to lean out due to...

Q: Car running hot even though I added antifreeze

The cooling system on this car has more than one problem that are common. The radiator clogged, thermostat and the cooling fan are the top three most common failures on the vehicle and would need further diagnostics to narrow the...

Q: Fuse keeps blowing. 1997 BMW 318i

Hello. It sounds like you may have a short in the brake switch or a short in one of the pig tails. It is also possible that there is a short in the brake light sockets for the brake light...

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 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...
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...