A/c compressor won’t engage - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Hcd3ss · 07-05-2019, 02:55 PM

What are the conditions that would keep the ac compressor from engaging? I have checked fuse #1 in the fuse box, and have unplugged the compressor to check signal. I assume I should see 12 volts at the plug that connects to the compressor, and there is no voltage there. Any help would be greatly appreciated.. thanks in advance.

sprintguy1 · 07-05-2019, 03:05 PM

Low Freon. It won't engage under a certain pressure. Have you checked it? The all in one cans will give you a reading without charging..

Greenhornet2 · 07-05-2019, 03:14 PM

Low freon or a bad pressure switch won't allow the clutch to engage

shibbs · 07-05-2019, 03:17 PM

Low R134, bad pressure switch, bad magnet clutch, bad relay, bad HVAC control..... there are MANY reasons why it wouldn't engage.

EDIT: if you checked the plug, that eliminates the magnet clutch.

PowertoLove · 07-05-2019, 03:58 PM

!st thing to check is the pressure at the low side port. Its the larger line located near the firewall on the drivers side. Attach a gauge without the engine running and you should see some where around 75psi. If you do have that then start the system and watch the gauge. The comp maybe turning on quickly then shutting off, that would indicate low system charge. If the comp doesn't come on and you have 75psi on the low side it could be many other things. Probably time to see a pro unless you want to toss parts at it. Good Luck

Look here for port location https://www.camaro5.com/forums/showthread.php?t=375088

anthony.martinez · 07-06-2019, 09:02 AM

a stable tune

07-05-2019, 03:14 PM	#3
Greenhornet2 Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019 Location: Connecticut Posts: 1,925	Low freon or a bad pressure switch won't allow the clutch to engage __________________ Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane

07-05-2019, 02:55 PM	#1
Hcd3ss Drives: 2011 camaro 2ss/RS Join Date: Nov 2013 Location: Waycross, Ga Posts: 80	A/c compressor won’t engage What are the conditions that would keep the ac compressor from engaging? I have checked fuse #1 in the fuse box, and have unplugged the compressor to check signal. I assume I should see 12 volts at the plug that connects to the compressor, and there is no voltage there. Any help would be greatly appreciated.. thanks in advance.

07-05-2019, 03:05 PM	#2
sprintguy1 Drives: 45th Anniversary Join Date: Nov 2015 Location: Florida Posts: 39	Low Freon. It won't engage under a certain pressure. Have you checked it? The all in one cans will give you a reading without charging..

07-05-2019, 03:58 PM	#5
PowertoLove Banned Drives: A Sneaky Fast Camaro Join Date: Jun 2019 Location: US Posts: 141	!st thing to check is the pressure at the low side port. Its the larger line located near the firewall on the drivers side. Attach a gauge without the engine running and you should see some where around 75psi. If you do have that then start the system and watch the gauge. The comp maybe turning on quickly then shutting off, that would indicate low system charge. If the comp doesn't come on and you have 75psi on the low side it could be many other things. Probably time to see a pro unless you want to toss parts at it. Good Luck Look here for port location https://www.camaro5.com/forums/showthread.php?t=375088

07-06-2019, 09:02 AM	#6
anthony.martinez Drives: 2010 Join Date: Dec 2018 Location: texas Posts: 119	a stable tune