hi guys i have a question about a 1994 dodge voyager van
the ac clutch wont engage but when i power one of the wires going
to the clutch coil it comes on and blows cold air in the interior
wondering what could be the problem any help would be great thank you

 

If the clutch engages when you bypass the switching system completely and feed 12V directly to the clutch, I'm going to guess that either you have a bad switch or bad/shorted switch wiring. Try unplugging the harness from the compressor/clutch and checking for voltage in the wire when you have the switch on.

 

There is a low pressure switch back by the expansion valve that won't allow compressor if the pressure is too low. There is a combo valve switch on the expansion valve used for clutch cycling and there is a high pressure switch on the compressor. When you press the a/c button on the control panel, the signal goes through all 3 switches and to the PCM. Most likely one of these switches is causing your issue. The low pressure switch is 2 wire, just unplug it and jump it. If you get compressor, either bad switch or the pressure is too low. The high pressure is also 2 wire and can be jumped. The combo is a 3 wire, jump brown wire to the brown wire with white tracer. See if you have any luck.