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1992 190e
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Greetings All,
It has been a while. My Aux fan runs constantly during the summer, and occasionally during the winter. Please assist
 

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Check your Temp sensor on the Accumulator/Drier. This turns your aux fan on when the AC is on. If you short the two wires together your fan should come on.
 

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Check your Temp sensor on the Accumulator/Drier. This turns your aux fan on when the AC is on. If you short the two wires together your fan should come on.
Same thing with the temp switch located on the head.

If the fans turn on at high speed (loud whirring and BOTH fans spinning fast) then the temp switch on the head may be bad.

The AC drier switches are to engage the fan switches on low speed from what I understand, when AC is in use and refrigerant has reached a certain temperature or pressure (hence the two switches on AC drier).
 
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