A/C does not engage. I can hear the relay switch on, by the compressor never kicks in.
Most vehicles have a low pressure switch that prevents the compressor from engaging so as to prevent damage to the compressor. You need to place a gauge set onto your AC to read the high and low sides of the system. Probably have lost enough gas(R134) over time to prevent the compressor from engaging. You can jump the pressure switch to check it with a simple jumper wire.
SOURCE: 1995 z-28. air conditioner compressor won't kick
Your A/C pressure switch may have gone bad or the wire harness to it may have gone bad. The switch is along the low pressure line or on the A/C Accumulator ( looks like a silver canister) , Unplug the wire and you can jump it there and see if the clutch comes on, if it does try spreading the two tabs apart on the switch and clipping the wire back on. If it does not come back on you need to replace the switch, you can do it with out loosing to much R134A. Just got to be quick when you remove the old one and placing the new one. The low side should have a reading of 30PSI to 50PSI and the high side should have 150PSI to 200PSI. Any other reading will give you poor A/C performance. Good luck and hope this helps.
SOURCE: Ac compressor won't kick on
Just had the same issue and posted. Just found the solution is the control module in the dash. Went to the junk yard since new is expensive on these units. Plugged new unit in, was able to charge a/c now blows cold as ice.
SOURCE: AC compressor won't engage anymore
If you have 49 psi in the system with it not running, you don't have enough freon in it. If it is low it could have shut it self down. Try unhooking the battery to reset the system.
SOURCE: 2000 silverado ac problem
Mine has always done this. As far as I can tell it is just Engaging in anticipation of a Person wanting to change the Temp. Computer Signals it to do this.
629 views
Usually answered in minutes!
Where is the pressure switch? Also, where can I get a gauge set?
"You can jump the pressure switch to check it with a simple jumper wire" - where is the pressure switch? Also, where can i get a guage set? Will a guage that comes with a can of R134 due?
×