Originally Posted by
lostforawhile
the AC and fan system on the lxi takes up two entire pages in the electrical troubleshooting manual. mostly to add the timer unit for the fans, and the secondary thermo switch, to run the auxiliary/condenser fan if the engine is over a certain temp at shutdown, the DX is really simple, thermosensor in the radiator, grounds the coil of the fan relay in the underhood fuse box, both fans run, the AC system is complex, but it still provides a simple ground to the same relay coil terminal, through the diode box, mine is just as simple, since I changed the factory fuse box etc, one 40 amp Bosch relay from the yard, complete with weatherpack plug, under the hood, ground from the thermo switch operates the relay coil, coil power comes from ignition, and power comes from my underhood junction block, with it's own inline fuse, actually tapped off of the wire from the alternator, since it's already going to the junction block. I've considered an additional aftermarket thermo sensor for the aux fan, so it only comes on when it's really hot, hot weather, traffic etc, I think under most conditions one fan running would be just fine
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