73 AC won't charge.
Thread Starter
Intermediate
Joined: Jul 2018
Posts: 47
Likes: 6
73 AC won't charge.
Need some help with my AC system on my 73. I installed a new S6 compressor, which is much lighter then the old A6 also installed the VIR Eliminator to convert over to 134a. I evacuated the system and it will hold a vacuum forever, so I have no leaks. The problem I am having when I go to charge the system is that it will take a can and a half of 12oz 134a and both low and high pressures go to 100psi and stop.. I know the low side should be around 30 to 40 psi and the high should be around 250 give or take. This is with a jumper on the compressor to make sure the clutch is engaged which it is. What am I over looking or doing wrong?
Melting Slicks
Joined: May 2015
Posts: 2,365
Likes: 428
From: Cape Girardeau Missouri
Need some help with my AC system on my 73. I installed a new S6 compressor, which is much lighter then the old A6 also installed the VIR Eliminator to convert over to 134a. I evacuated the system and it will hold a vacuum forever, so I have no leaks. The problem I am having when I go to charge the system is that it will take a can and a half of 12oz 134a and both low and high pressures go to 100psi and stop.. I know the low side should be around 30 to 40 psi and the high should be around 250 give or take. This is with a jumper on the compressor to make sure the clutch is engaged which it is. What am I over looking or doing wrong?
Le Mans Master
Joined: Jun 2019
Posts: 7,670
Likes: 2,474
From: Indiana
well whatever is in there is not restricting the flow to vaporize it just before the evaporator...
or your compressor is not compressing...
i wouldnt jumper the clutch for long only to test..
did you put lube in? Did you manually circulate the compressor to clear oil?
You could also have let air in...
i would pull vacuum again and start over....
luckily its cheap and not r12 like mine
or your compressor is not compressing...
i wouldnt jumper the clutch for long only to test..
did you put lube in? Did you manually circulate the compressor to clear oil?
You could also have let air in...
i would pull vacuum again and start over....
luckily its cheap and not r12 like mine
Last edited by interpon; Jun 2, 2020 at 08:49 PM.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Do you have long tube headers ? If you do the A/C lines either touch the exhaust tubes or are very close and will not allow the A/C to work as the exhaust temps heat up the A/C lines
With LT's you have to bend the A/C lines so you have at least a1/2 inch clearance from the lines and the exhaust tubes
With LT's you have to bend the A/C lines so you have at least a1/2 inch clearance from the lines and the exhaust tubes
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Racer
Joined: Jan 2016
Posts: 290
Likes: 78
Possibly bad compressor. Wouldn't rule it out but even a bad compressor that can only build 100 psi would have 5-10 psi on low side if orifice was good unless your pressure readings are actually static pressure with the clutch engaged in which case I would agree with a wiped out compressor.
