No power to AC compressor
Thread Starter
4th Gear
Joined: May 2021
Posts: 4
Likes: 1
No power to AC compressor
Hello,
I have a 76 Stingray with factory installed AC. I recently replaced the Engine Harness to fix a short I was having with the cabin blower motor. I've moved on to the AC system.
With the engine off, I supplied 12v of power to the AC compressor and the clutch engaged. With the engine on, the AC compressor clutch wouldn't engage when tried to activate through the interior controls. I checked the individual connections on the AC blower motor control switch and they were all good.
My next thought was to check the AC power relay, but I suspect it might be concealed under the dash. Any thoughts?
I have a 76 Stingray with factory installed AC. I recently replaced the Engine Harness to fix a short I was having with the cabin blower motor. I've moved on to the AC system.
With the engine off, I supplied 12v of power to the AC compressor and the clutch engaged. With the engine on, the AC compressor clutch wouldn't engage when tried to activate through the interior controls. I checked the individual connections on the AC blower motor control switch and they were all good.
My next thought was to check the AC power relay, but I suspect it might be concealed under the dash. Any thoughts?
Safety Car
Joined: Oct 2007
Posts: 4,383
Likes: 1,755
From: Seattle Area Washington
If not Willcox Corvette provides a decent A/C line diagram for your 76.
LINK: http://repairs.willcoxcorvette.com/w...-schematic.png
I have a 77 so controls are different,
With You A/C controls ON do you have 12vdc on the tan wire at the pressure switch? Not sure where on a 76 but it is in the engine compartment. On my 77 it is near the coolant overflow tank.
If so do you have 12vdc on the DK.Green wire at pressure switch, If not your system is low on refrigerant.
LINK: http://repairs.willcoxcorvette.com/w...-schematic.png
I have a 77 so controls are different,
With You A/C controls ON do you have 12vdc on the tan wire at the pressure switch? Not sure where on a 76 but it is in the engine compartment. On my 77 it is near the coolant overflow tank.
If so do you have 12vdc on the DK.Green wire at pressure switch, If not your system is low on refrigerant.
Last edited by bmotojoe; Jun 3, 2021 at 11:02 AM.
