ac compressor not engaging on 1998 Cadillac DeVille

ac will not come on, refrigerant full, no power at compressor relay, only power at one terminal on compressor relay

Asked by for the 1998 Cadillac DeVille
1 answer 1 comment
Have you tried supplying power to the compressor and see if it engages if not the compressor clutch has a problem. If it does engage
you will have to do some diagnostic tests and follow trouble shooting flow charts. You will need a wiring diagram, good volt/ohm meter and information. Alldata is probably the best source for information. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
Autozone have some popular workshop manuals for free on line once you register (for free) on their website
and get an online repair manual subscription.
yes i have powered up compressor with my power probe 3 throught the relay termanal and it workes poperly, and cools , i am woundering does the control head sent power to the other ac compresssor termanal at the relay thanks aabjr