C-3 A/C charge help
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
C-3 A/C charge help
A/c gage reading when attached after I press trigger. Acts like it is blocked. NO fluid going into unit/pump????
Is this where I hook up A.C canister to charge???IS thid the low side?
This the high temp switch?? I do not hookup to this??
This port on canister is on right side.very tight.
This canister port is more accessible, Is this the port I should be using??
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
You're on the right port. With the trigger pulled you should be seeing can pressure, 80 psi or more. With trigger released you should see system pressure. Between the red lines on the gauge.
If the pressure is only 50 with trigger pulled then the can is empty or not screwed on far enough and you are seeing system pressure unless the trigger is broke or something.
If the pressure is only 50 with trigger pulled then the can is empty or not screwed on far enough and you are seeing system pressure unless the trigger is broke or something.
Last edited by REELAV8R; Jul 27, 2017 at 10:53 PM.
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
You're on the right port. With the trigger pulled you should be seeing can pressure, 80 psi or more. With trigger released you should see system pressure. Between the red lines on the gauge.
If the pressure is only 50 with trigger pulled then the can is empty or not screwed on far enough and you are seeing system pressure unless the trigger is broke or something.
If the pressure is only 50 with trigger pulled then the can is empty or not screwed on far enough and you are seeing system pressure unless the trigger is broke or something.
The car did not come with air, it is one of 3500 heat only production cars.
I think I had wires hooked up wrong and I am missing a Thermostatic control switch which would connect to the two wires I had connected to the low pressure switch. IF I touch them together the clutch engages.
thanks for the assistance....
DB
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Are you charging it with 134a or R-12?? What refrigerant was in the system? That vintage GM A/C system used mineral oil as a lubricant and that is not compatible with 134a (unless you add ester oil to it).
Apples and oranges....be careful. If that system has been converted to 134a/PAG oil already, no big deal.
Apples and oranges....be careful. If that system has been converted to 134a/PAG oil already, no big deal.
Last edited by 7T1vette; Jul 28, 2017 at 10:28 PM.
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
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From: Dayton Nevada
Are you charging it with 134a or R-12?? What refrigerant was in the system? That vintage GM A/C system used mineral oil as a lubricant and that is not compatible with 134a (unless you add ester oil to it).
Apples and oranges....be careful. If that system has been converted to 134a/PAG oil already, no big deal.
Apples and oranges....be careful. If that system has been converted to 134a/PAG oil already, no big deal.
Thanks for the caution note...
DB
Last edited by Douglas Brown; Jul 28, 2017 at 10:44 PM.
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Le Mans Master
Joined: May 1999
Posts: 6,692
Likes: 29
From: Texas
A/c gage reading when attached after I press trigger. Acts like it is blocked. NO fluid going into unit/pump????
Is this where I hook up A.C canister to charge???IS thid the low side?
This is the high pressure port.
This the high temp switch?? I do not hookup to this??
This port on canister is on right side.very tight.
This is the low pressure port and what you connect to when charging the system.
This canister port is more accessible, Is this the port I should be using??
See my posts under the relevant pictures.
Last edited by Wrecked82; Jul 29, 2017 at 08:27 PM.
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
Just a heads up, I have ran into 2 different vettes that had that 90 deg adapter fitting on the low side port, but the installer had not removed the original schrader valve, caused interesting readings on the gauge.
Burning Brakes
Joined: Dec 2005
Posts: 992
Likes: 56
From: Baldwinsville, NY
I could never get the 90 degree elbow to work. Had to take out the compressor adusting bolt, install the filling hose and reinstall the compressor bolt.
After years of non functioning system I installed new seals, new hoses, accumulor, cross flow condencer and a Sanden compressor. Now it works here in Syracuse NY, maybe not in Florida, that would take a ac/heater box rebuild.
After years of non functioning system I installed new seals, new hoses, accumulor, cross flow condencer and a Sanden compressor. Now it works here in Syracuse NY, maybe not in Florida, that would take a ac/heater box rebuild.
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
DB
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
Likes: 11
From: Dayton Nevada
I could never get the 90 degree elbow to work. Had to take out the compressor adusting bolt, install the filling hose and reinstall the compressor bolt.
After years of non functioning system I installed new seals, new hoses, accumulor, cross flow condencer and a Sanden compressor. Now it works here in Syracuse NY, maybe not in Florida, that would take a ac/heater box rebuild.
After years of non functioning system I installed new seals, new hoses, accumulor, cross flow condencer and a Sanden compressor. Now it works here in Syracuse NY, maybe not in Florida, that would take a ac/heater box rebuild.
Lets hope I have better luck.
Le Mans Master
Joined: Jan 2001
Posts: 6,746
Likes: 1,387
I have a set of gauges with 90° connectors. Works well on my Sanden & Hot Rod Air because otherwise I could not connect to low side fitting. Of course, I wasted a can recently because I spaced that and attached to my regular straight-hose filler/adapter.
If folks can find a similar hose, then it may assist with some of these issues with connection access.
If folks can find a similar hose, then it may assist with some of these issues with connection access.
Last edited by carriljc; Jul 30, 2017 at 01:19 PM.
Thread Starter
Pro
Joined: Jun 2012
Posts: 603
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From: Dayton Nevada
I have a set of gauges with 90° connectors. Works well on my Sanden & Hot Rod Air because otherwise I could not connect to low side fitting. Of course, I wasted a can recently because I spaced that and attached to my regular straight-hose filler/adapter.
If folks can find a similar hose, then it may assist with some of these issues with connection access.
If folks can find a similar hose, then it may assist with some of these issues with connection access.
I thought I would check out the suggestion about the needle valve. I was right I had taken out the orig. one.
And the other suggestion about connection hose being bad, so I disconnected the hose from the canister, WHY I thought it would close off when disconnected is beyond me, but it shot out of my hand and spun around the floor for a minuet. The hose when connected to the 90 deg. fitting is open.
DB