GMC Troubleshooting Questions? Ask a Mechanic for Answers
hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.Roy
ok, attached a wire diagram for you to view
do you have any power to the low pressure switch??
did you verify powers to the ac clutch relay???
check ignition fuse E in the fuse box. that powers the control side of the relay which is terminal 85
with the relay plugged in, can you test terminal 85 for power???
ok, are you using a volt meter or test light
is there freon in the system???
ok, good. when you probed the relay with the test light, it should have created a ground, which is what terminal 85 is for. if the relay did not energize, the relay is bad.
can you switch it with another relay???
with the horn relay in, can you re check terminal 85 with the test light??? the test light should provide a ground and activate the relay
are you there
are we going to continue???