In the description it was indicated that although the cooling fans cycled they didn't run continuosly with the a/c on. It was also indicated that there wasn't any power at the compressor. This leads me to believe that the low pressure switch is probably holding back the power due to a low pressure condition in the system. There is no high pressure switch although the manual mentions one. The cooling fans are supposed to cycle against the otterstadt switch in the coolant pipe but if the mode switch is in the A/C position and the low presssure switch is "on" it forces the cooling fans to run continuosly. If the A/C cylcles against the low pressure switch the fans might shut down if the otterstadst switch is satisfied. I think the fanzilla will force the cooling fans to run when the A/C switch is on regardless of the otterstadt or low pressure switch. Just because the cooling fans run you cannot assume the power is comming from the mode switch. The fact that there was no power at the compressor clutch means the cooling fans were not being run by the A/C circuit. There is no need to worry electricaly about the compressor clutch since it won't run if no power is present.(You can always just do a continuity check of the coil on the compressor clutch) The trouble is in the circuit before that. I think that your understanding is not taking into account that the cooling fans can be run from 2 different circuits, the otterstadt switch and the A/C compressor circuit. David Teitelbaum vin 10757 --- In dmcnews@xxxx, dherv10@xxxx wrote: > David, As per the diagram, The voltage comes thru #10 fuse the > goes thru the mode switch then goes thru a low pressure and > some cars may also have a high pressure switch. [moderator snip]