dodge68charger
Well-Known Member
How Are You Guys Going about Charging Your A/C Systems?
IF you can find and afford R12, great....its very effective, and easy to install, providing you have evacuated the system to at least 28" vacuum to remove all traces of moisture, which usually takes about one hour. If you have a sight glass in your system, charge to a clear glass on the suction side if the compressor. A good low side system pressure is approximately 35 psi which should result in approximately 40° F air temp. I'm sure others will have their own opinions and preferences. R134A has similar pressures but the system will be "full" at about 2/3 the volume of R12. Just my opinion of course.How Are You Guys Going about Charging Your A/C Systems?
Thanks Guys. That R12 is Hard To Find!
The commercial HVAC industry uses nitrogen to pressure test systems after repairs. Find a friend in the business, and put about 100 psi nitrogen on the system. You'll find your leaks. If you can remove the pulley first, so much the better. That way you can see the shaft seal. It's one of the spots most likely to leak. Be careful with the threads on the condenser outlet, they're aluminum. Use a little light oil on them and the others when assembling.
I believe, the rubber hoses also need to be converted over as the molecules in 134A are smaller and will seep out of the older style lines.If you convert to 134A the oil should be changed, the service ports need to be changed (adapters are available), and 80% of original R12 charge will be enough 134A refrigerant for a charge.
I flushed all my system components and even went through the compressor ( for inspection and complete oil change out). I also pulled out the EPR valve on recommendations I found on line. Without the EPR valve there is no control over evaporator temperature so I found a thermostatic, adjustable switch to cycle the compressor to avoid freeze up.
All my changes are untested as of this date. I won't be able to confirm these changes until warm weather returns.
Mike
I believe, the rubber hoses also need to be converted over as the molecules in 134A are smaller and will seep out of the older style lines.
I thought it was the oil used with the R134 it did not like