Quote:
Originally Posted by Jeremy5848
Correct. Low speed aux fan is switched on by the a/c system, high speed by engine heat. Two different relays in the relay/fuse box, low speed relay has a resistor to reduce the fan's current and slow it down.
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Or connects to a big resistor [1989 300E], mounted near the receiver/dryer behind the driver's side headlight [juice to one side is high speed, the other is low speed]