converting 1980 AC to 135a
Thread Starter
Safety Car
Joined: Apr 2007
Posts: 4,435
Likes: 9
From: Kalamazoo Mi
converting 1980 AC to 135a
Ok, here is the deal, the ac system had a leak, so i fixed it. Tried to charge it with 135a, blows warm air now (but is still holding pressure).
What parts need to be changed out to convert the system from R12 to R135a.
i have searched but i have not found a good "parts list"
Does the compressor need to be changed? if so, which one will work?
What parts need to be changed out to convert the system from R12 to R135a.
i have searched but i have not found a good "parts list"
Does the compressor need to be changed? if so, which one will work?
Race Director
Joined: Aug 2007
Posts: 10,977
Likes: 19
From: Canboro Ontario
Not sure, but I picked up a kit for about $35.00 at Carlisle a few years ago, and had someone else make the swap, I think oils and O rings have to change in the compressor and new fittings, put on your lines, you are supposed to change the dryer and evaporator due to R-12 contamination, but I didn't, and it seems to work fine.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Why change at all?
To change, you need to replace the accumulator and orfice tube and at least blow out the lines to get as much old oil out as possible. Put in new oil and charge to about 2/3 the original charge. My experience is mixed with GM R4 compressors-some immediately eat the front seal, others don't. If I was going to do the swap, I'd change the compressor and be done with it. R134 is much more sensitive to charge than R12. You really need gauges to do it right and you absolutely have to vacuum it out before you charge it.
To change, you need to replace the accumulator and orfice tube and at least blow out the lines to get as much old oil out as possible. Put in new oil and charge to about 2/3 the original charge. My experience is mixed with GM R4 compressors-some immediately eat the front seal, others don't. If I was going to do the swap, I'd change the compressor and be done with it. R134 is much more sensitive to charge than R12. You really need gauges to do it right and you absolutely have to vacuum it out before you charge it.
