Skip the auto shop - Our mechanics make house calls

Q: Why are the fans staying on when the car is off to where I have to pull the fuse?

asked by on

The car is a 2008 Acura RDX. The two radiator fans are staying on well after the car is off. I had to pull the 30A fuse under the hood to get them off. 24 hours later I replaced the fuse without turning on the car and the fans came on again. What is the most likely cause?

The fans are controlled by a relay as well as a temperature switch and possibly timer(s). The relay may be stuck in the closed position and that would be the first and easiest component to test. If a relay tests bad, typical protocol is to test the rest of the circuit as well, to be sure there are no other malfunctions. I would recommend an inspection of the cooling fan relay. Such an inspection (and replacement of the part, if indicated) is performed on a mobile basis right at your location. Hopefully, we can resolve this for you but if you have additional questions or concerns by all means please let us know.

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!
  • Home
  • Questions
  • Why are the fans staying on when the car is off to where I have to pull the fuse?

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: Air not working

Hello. There are many components involved in the air conditioning system, and many possible points of failure. If no air is coming from the vent, you can consider the interior fan and its circuits. Cool or warm air when the...

Q: Car stops when put in drive or reverse

This may be a sign of a faulty MAP sensor as the vehicle responds adversely to a load put on the motor (i.e. putting it in gear, making turns (which makes use of the power steering pressure switch) turning on...

Q: What does it mean when the MIL stays on after car if shut off?

You may have a sticking EFI relay in the main fuse box in the engine compartment. This relay if stuck on can keep power to the computer to turn on check engine light. Replace the relay and then retest. ...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...