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  #1  
Old 11-18-2014, 12:52 PM
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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.
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Old 11-18-2014, 01:57 PM
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No leak on the floor? Have you checked your coolant level?
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Old 11-18-2014, 02:12 PM
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There are no visible coolant leaks and the coolant level is full. Thanks for the help.
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Old 11-18-2014, 06:22 PM
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Quote:
Originally Posted by rlcarlse View Post
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.
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Old 11-19-2014, 02:47 PM
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I read many posts that electric water pump failure can cause this loud fan noise and no hot air from the heater.
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Old 11-19-2014, 03:13 PM
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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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