GordDavey
Senior Member
- Joined
- Jan 2, 2019
- Posts
- 218
- Reaction score
- 108
- Location
- Toronto, Ontario
- Ram Year
- 2015
- Engine
- Hemi 5.7
Hi All, I'm having a problem with the A/C in my 2015 Ram 1500. As it was rebuilt after an accident, I highly doubt any warranty would be valid, that being said I have 1 issue left to resolve with the truck, my A/C not working.
My professional mechanic is also a licensed A/C guy, but has never dealt with the Variable Displacement A/C compressors that are now standard for our trucks. He's dealt with the refrigerant R1234yf, but not the A/C compressor itself, so I have a few questions.
The issue is the A/C clutch will NOT engage. I am trying to find a way to diagnose the clutch issue manually. There are 2 connectors for the A/C compressor, the C1 connector at the top and front, and the C2 connector under and towards the back. We have no idea if there are electronic circuits inside the compressor itself for it to make any of it's own decisions, we figure not and that the ECM and HVAC module make all the decisions. I need to figure out for sure if the compressor/compressor clutch is bad before making the massive investment to discharge, replace the compressor unit and recharge it. (like 2000+ CDN)
I imagine C1 connector controls the compressor clutch engagement and C2 controls the swag(?) angle, but I need this confirmed.
What voltage would be measured across the C1 connector to know it is receiving the correct power?
What the resistance should be when measuring across the 2 pins on the compressor itself (C1 disconnected from compressor, and resistance from the compressor itself and not from the engine harness.)
What voltage would be measured across the C2 connector's body harness side?
What resistance would the compressor side of the C2 connection should be?
Is there a way to manually check the compressor's clutch engagement? The old fixed displacement A/C compressors you could just apply battery power to them, and it would engage and disengage, but we're unsure with the variable type. Does the engine need to be running to manually test the clutch engagement? or can you just supply battery power to it and it would toggle on and off like the old style did?
Any info/help would be much appreciated.
My professional mechanic is also a licensed A/C guy, but has never dealt with the Variable Displacement A/C compressors that are now standard for our trucks. He's dealt with the refrigerant R1234yf, but not the A/C compressor itself, so I have a few questions.
The issue is the A/C clutch will NOT engage. I am trying to find a way to diagnose the clutch issue manually. There are 2 connectors for the A/C compressor, the C1 connector at the top and front, and the C2 connector under and towards the back. We have no idea if there are electronic circuits inside the compressor itself for it to make any of it's own decisions, we figure not and that the ECM and HVAC module make all the decisions. I need to figure out for sure if the compressor/compressor clutch is bad before making the massive investment to discharge, replace the compressor unit and recharge it. (like 2000+ CDN)
I imagine C1 connector controls the compressor clutch engagement and C2 controls the swag(?) angle, but I need this confirmed.
What voltage would be measured across the C1 connector to know it is receiving the correct power?
What the resistance should be when measuring across the 2 pins on the compressor itself (C1 disconnected from compressor, and resistance from the compressor itself and not from the engine harness.)
What voltage would be measured across the C2 connector's body harness side?
What resistance would the compressor side of the C2 connection should be?
Is there a way to manually check the compressor's clutch engagement? The old fixed displacement A/C compressors you could just apply battery power to them, and it would engage and disengage, but we're unsure with the variable type. Does the engine need to be running to manually test the clutch engagement? or can you just supply battery power to it and it would toggle on and off like the old style did?
Any info/help would be much appreciated.