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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 11-18-2012, 06:10 PM
senikc senikc is offline
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Location: Milledgeville, Ga
 
Join Date: Oct 2012
Posts: 76
Mein Auto: 1994 Mercedes E320
Aux cooling fan

I have a 99 Z3, the electric aux fan in front of the radiator runs all the time. Should this run when engine is cold and no a/c is on?
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Old 11-18-2012, 06:40 PM
Blacklane Blacklane is offline
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Location: Springfield, Ohio, USA
 
Join Date: Jun 2011
Posts: 1,087
Mein Auto: 1998 Z3 Roadster
Nope. It should only run for (a) temperature sensor on the radiator sensing above 91C, or (b) the air conditioning is on. It should then go to high speed if the coolant gets above 99C.

It could be a stuck relay. It would be the purple one or the yellow one in back. At least the yellow one can be swapped for a quick test.

Or it could be the temperature sensor on the side of the radiator. Just unplug it and see if the fan stops.
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Old 11-18-2012, 08:15 PM
senikc senikc is offline
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Location: Milledgeville, Ga
 
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Mein Auto: 1994 Mercedes E320
Aux cooling fan

Thanks for the info, I didn't think it should run.
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