so last summer the a/c stopped being cold. i followed advice of previous posts and recharged myself to the recommended pressure (it took less than one tall can) using pressure gauge that came with the can. got cold air for a while but then stopped again maybe 1 week later. the port (the one towards the windshield end of engine) where i added the freon still has high pressure, but the port at the other end has little pressure.
Is it possible I need to put more freon in the system? As I understand, if I overcharge that may cause damage. I would think if I have a leak, there wouldn't be pressure at the input port.
you have 2 ports in an A/C system.. a high pressure port(up to 250psi); and the low side port(around 25-40psi) depending on how much freon is in your system, and depending on how efficient your compressor is.
If you have lost freon and need to re-charge, it simply means that you have a system leak somewhere. Knowing that, a "re-charge will only give u a temp remedy - it being that when u have a leak, air/moisture also seeps into the system thereby making your system inefficient(freon and air/mosture don't like each other).
ood way to do your repair. Have your system vacuumed(old freon evacuated) and then recharge to specs using the newer R134a freon cans that contain a "stop leak" solution, and a dye tht can help u identify where the leak might be at a future time :-)
low side pressure port( the blue covered port) should have read around 35psi.
From what I've heard, the system needs to recharged periodically even without an actual leak (in other words, even a sealed A/C system has expected normal leakage over time). True/false? <<< FALSE. You look at A/C in much the same way as your house refrigerator. If we go by what you heard, the it means tht we have to recharge our refs periodically??? tht doesn't sound right does it?... considering that A/C and refrigeration operate based exactly the same principles :-)
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