I updated my 72 MC from R12 to R134a. It blows hot - can't figure out why. It may be the flush liquid or a POA?? I put in new Seals, Compressor, Dryer and Exp valve. It does not blow cold - maybe low 70's. If memory serves me, my pressure at 1500rpm is 225/35. At idle it might be 250/50?
I meticulously flushed the system using Intertrans? flush. It looked like chicken broth with milk mixed in. Very Oily - I thought how could this work - but used it anyway. I dumped 1.5 Quarts in only to purge 25% of it. I understand the evaporator has many 'pathways' out - so no matter how much air pressure I blew in - not much came out. I then had a buddy purge it with R22. Again - another recharge. Still no cooler. BTW - I used a new oil too - It had a red label??? Foget the name - Pag?
I have read some of the articles to resolve this issue, but need more input. My buddy has a 72 Cutlasss - his works great. I understand it might have a5 degree higher temp - but that is fine.
The sight glass is foamy - but I heard you never get it clear with R134a. There are no leaks and the hoses appear so soaked with R12/Oils that they seal well.
Now I don't know how a POA works - but could it be bad? Do my pressures indicate a blockage? Most importantly - is that flush kit I used screwing things up - I assume the flush has mixed well with the freon - but I can't seem to purge it.
I am open to do whatever necessary - just don't want to pull and clean the evaporator or replace it or the condensor unless i have to.
One last thing - out of frustration, I took it to a local shop to have them check it out. Just diagnoze so I could preferably fix. They were kinda irritated but checked it anyway and said that no matter what I did - it would never cool. They said the evaporator was too small as well as the condesnor. The evaporator may indeed be too small, but the condensor is huge!.
I read some archive articles and am now aware of the POA tube in Fort Worth - this will be done - can you guys help me out? Thanks - I think it might be the flush kit or POA.