There are usually two sets of wires -- one for a low refrigerant
pressure switch (to save the compressor if the freon leaks out) and a
pressure or temperature switch to kick the auxillary fan in on low
speed. If you short the two wires for the fan switch together with
the ignition on and the fan does NOT run, either the relay, the fan,
or the fuse is bad.
The fan is also kicked on in high speed by the temperature switch in
the thermostat housing. Pull that wire off the switch and ground with
the ignition on, fan must run on full speed. If not, it's the fan,
the fuse, or the relay.
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