[Raindoc]

Thanks guys. The diagram helps but there are some differences between it and my blazer's wiring. My fan switch seems to only have a high & low fan speed (again it is not working at all but I can only find three positions). I only have three wires in the plug; one from fuse box, one to fan relay, one for high and one for low. Was there another switch used or is mine so far gone that it does not show up. Is the compressor switch/diverter cable located on the back of the lower air box on the fire wall side just above the passinger's left foot? Where is the "diebeling relay" located? Where is the fan resistor located.

What is the benefit in upgrading the wiring? Mine looks good in general. although the wire to the compressor has been cut at the fan and there may be a wire missing for the fan switch.