Skip the auto shop - Our mechanics make house calls

Q: Radiator fan running max

asked by on

My BMW radiator fan is running full blast I checked coolant it was full. Don't know what other stuff I can check

My car has 80000 miles.
My car has an automatic transmission.

The issue you are having is either an electrical issue, or it is a cooling problem. The first step to take is to have the vehicle scanned for diagnostic troubleshooting codes. If the computer detects an issue, you will see it there.

Now, the more common issue is overheating. If there has been any damage to the vehicle around the fan or radiator, the radiator may be failing. This forces the fan to compensate in decreasing the temperature of the coolant. Poor cooling can also come from poor coolant quality. The cooling properties will wear out over time, and if the coolant has never been replaced, the fan may be doing a majority of the work. You can always have a technician, such as one from YourMechanic, evaluate the cooling system for you.

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: How do I tell if my power steering is going bad in my 2005 BMW x3?

Hi, thanks for writing in. Unfortunately, it sounds like your steering rack is done for, and needs to be replaced. This appears to be a wide-spread problem with this vehicle, without a recall or customer satisfaction program from BMW. If...

Q: Difficulty changing gear. Has become very stiff, mainly second gear and reverse. Only 30k miles 2009 Toyota Yaris

Hello - most likely one or both of your shifter cables needs to be replaced, because of lack of lubrication inside the cable. The colder weather highlights this problem (probably shifts better after you've driven a bit, right?). I would...

Q: Would a water saturated air filter result in an immediate engine seizure 2016 VW Touareg

Hi there - the answer to your questions is "maybe". Since water does not compress at all, it takes very little water in a cylinder to cause "hydro-locking" which will cause serious damage to your engine. Perhaps a bigger question...

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...
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.
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.