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The climate control system controls the fan(s). There are two relays in the back of the fuse box on the right. The left one controls the regular speed through the engine temp sensor to the climate control system and the right side relay is controlled by the pressure switch on the receiver/dryer. The pressure switch is the top one with the long leads. The relay operates the fan through the large resistor under the brake master cylinder for lower speed operation. There is one fuse, or two, I can't remember right now.
You can test the low speed fan operation by disconnecting the wires at the pressure switch, connecting the leads together and turning the key on. The fan should start. Check for blown fuses, a cracked resistor or seized fan.
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Regards
Warren
Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor
Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL
ENTER > = (HP RPN)
Not part of the in-crowd since 1952.
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