Need A/C help please

sitn_on_20s · March 21, 2004

well its starting to heat up here in texas and my a/c isn't working. i have a brand new A/C control head in it. any how it blows "not cold" air from all vents. the compressor isn't turning on. i've tried to jump the low psi switch to see if it would come on but it didn't. so i jumped the A/C relay under the hood, and the compressor kicked on and blew cold air after about a minute. can someone piont me in the right direction please i am dying here. i have access to a gauges if you need more info. BTW i pressed both shrader vavles in just to see if there was freon and some blew out, but if the system is low won't that keep the compressor from kicking or no? thanks

beebow · March 21, 2004

Just a thought: if you have the same relay for your stop lights and your A/C in the fuse block under the hood try exchanging them to rule out the relay as your problem. If the A/C works with the relays exchanged your in business. I'm in AZ so I feel your pain.

sitn_on_20s · March 22, 2004

i tried by-passing the the relay with the starter relay, no change. i can however,

jump the the a/c relay and the a/c compressor kickes on and it starts cooling the truck? anyone got any ideas?

thanks

AZ-Z71 · March 22, 2004

Make sure it is the same relay. Even though the thing looks the same I noticed on the sides of two of them the other day that the wiring diagram is different. Not sure which ones I looked at but maybe worth the check.