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E90/E91/E92/E93 (2006 - 2013)
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Old 01-16-2016, 12:39 PM
Sambrb Sambrb is offline
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Location: Toronto, Canada
Join Date: Jan 2016
Posts: 2
Mein Auto: BMW 330xi
Radiator fan starts as I turn on the heater, and drops the temperature...

I have a BMW 2006 330xi E90.

If I don't turn on the heater, the car works well and the coolant temperature stays around 85 Centigrade (185 Fahrenheit). As soon as I turn on the heater, the radiator fan starts to work and lowers the temperature to 65 Centigrade (149 Fahrenheit).

As soon as the coolant temperature reaches 65 Centigrade (149 Fahrenheit) the radiator fan starts IF THE HEATER IS ON; if the heater is off, the radiator fan does not start.

I live in Canada and it is cold; I don't get much heat from the heater, and it is driving me crazy! Any idea what is going on?
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Old 01-17-2016, 07:04 AM
fdriller9 fdriller9 is offline
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Location: NJ/Philly
Join Date: Oct 2006
Posts: 6,584
Mein Auto: '06 AW 330xi
Check your coolant level on a COLD motor.

If it's low, top off with approved fluid.

Also if you need to top off, you have a leak in your coolant system

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Last edited by fdriller9; 01-17-2016 at 07:05 AM.
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