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There are 3 relays which can provide a direct path (archive)

[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]

Posted by Rainman on August 08, 2001 at 14:16:35:

In Reply to: Aux Fan is Possessed posted by Bear on August 08, 2001 at 12:57:24:

to the auxillary fan motor on your car, they are k21, k22 and k33. k21 and 22 are the low and high speed relay. k33 is from the motronic airconditioning relay and provides a direct path to the low speed resistor on the fan.


The AC cooling on my 1988 750 has been less than great, after several hours of driving the cooling starts to fade. I decided to check the auxilliary fan out so I disconnected electrical lead on the dual range temperature switch, right side of radiator,turned on the ignition, and the aux fan stated up (low speed I believe). I then removed both of the fan relays and (you guessed it) the fan still runs. No electrical temperature switch connected, no relays in place and still she runs. I think some Jaeger Meister is in oreder while I ponder this one. Any suggestions from the crowd?

Very Confused Bear





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