Climate control testing

["Nate Stuart" <nathan.stuart@maine.edu>]

How do I pull the prob. codes for my climate control system on my '87
5kcstq????

I cannot seem to locate my A/C problem. The clutch will not engage at all. I
have jumped a +12v wire to the clutch actuator and it did engage and turn,
however the A/C system is not turning it on. I have tried disconnecting the
multi-function temp. sensor to no avail(was told if it was innoperative it
could cause this.) What other sensors can I test, and where is the pressure
sensor switch???
The rest of the A/C system seems to be working correctly, ie. the engine fan
turns on, the flaps open and the blower runs, but no compressor.

BTW, how much would it cost to have a garage recharge the A/C system if I
already have the freon???