The aux fans work a bit different on the 1990 to 1995 SL's than other MB's. The A/C pushbutton signals the low speed relay any time the compressor is on. The GREEN switch in the drier turns the aux fans to the HIGH speed when the A/C pressure reaches 295 lbs. This is done thru the pushbutton to the relays.
If the A/C isn't on the 107C switch will turn the fans on to the high speed at that temp, also thru the pushbutton.
The low speed resistor is under the left headlamp.
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