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-   -   Very Loud Radiator Fan -- 2007 4.8 X5 (https://xoutpost.com/bmw-sav-forums/x5-e70-forum/98912-very-loud-radiator-fan-2007-4-8-x5.html)

rlcarlse 11-18-2014 12:52 PM

Very Loud Radiator Fan -- 2007 4.8 X5
 
Last weekend my radiator fan started coming on (very load and fast rpm) each time I start my car (within a few seconds of startup). The fan continues to run the entire time. The same thing happens when the car is cold or hot (recently driven). I swear it sounds like it is going to take off. Any suggestions on what is causing this? Thanks!

2007 4.8liter X5
140,000 miles
the outside temperature has been in the 40s F.

edwardmagichands 11-18-2014 01:57 PM

No leak on the floor? Have you checked your coolant level?

rlcarlse 11-18-2014 02:12 PM

There are no visible coolant leaks and the coolant level is full. Thanks for the help.

neilrmp 11-18-2014 06:22 PM

Quote:

Originally Posted by rlcarlse (Post 1016828)
Last weekend my radiator fan started coming on (very load and fast rpm) each time I start my car (within a few seconds of startup). The fan continues to run the entire time. The same thing happens when the car is cold or hot (recently driven). I swear it sounds like it is going to take off. Any suggestions on what is causing this? Thanks!

2007 4.8liter X5
140,000 miles
the outside temperature has been in the 40s F.

I had the same issue and I changed the coolant temperature sensor, that was the culprit in my case.

edwardmagichands 11-19-2014 02:47 PM

I read many posts that electric water pump failure can cause this loud fan noise and no hot air from the heater.

rh71 11-19-2014 03:13 PM

yup happened to me a couple months back - starts as soon as you start the car - the electric water pump failed. Sometimes it's the thermostat not reading correctly but less likely.


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