Truck AC service question
My truck's AC is low on Freon (shows all the classic signs but still functions). There are two schools of thought on recharging; Have a shop evacuate and recharge the system based on weight fo...
Forum Discussion
mkirsch wrote:
Probably 3 years ago now, my 2002 came up low on refrigerant to where the compressor would not run. I put in one of the large Walmart cans with the low side gauge. The system would not take it all in, and would it not take any from a fresh can. Lost a whole can of R134a to leakage, as once you pierce it, it's going to leak out.
So, I'm not sure where all these warnings about overcharging and such come about. The system will take in what it can take in, and no more, in my experience.
BTW, the AC continues to work just fine in my truck.
AT 90 degrees ambient, your low side pressure should be between 40-55 psi.
A can of 134a at 90 degrees is at around 82 psi.....so yes you can overcharge when the 82 psi forces its way to equalize the low side, and then your high side goes through the roof, hence why you need both gauges to accurately determine proper charge.
