Over filling AC system in '89 Taurus?

Question

On a 1989 Ford Taurus...what should the pressure be in the high side? When I was filling my AC system with R-134a, the needle would fluctuate... it was high, then it would drop, and seem to fluctuate as much as 50 psi as the AC compressor would cycle on and off while it was being filled, but it gradually increased. After I added the third can of R-134a (10 oz. per can, 30 oz. total), I shut off the engine, and could hear a sound like a high pressure gas leaking out, but it decreased and ceased after about 20 seconds. It sounded like it was leaking from the front of the AC compressor. That was a week ago. Now I haven't heard the leak lately, but I also haven't been listening too hard for it. I'm not sure if I over filled my AC system. I obtained a compressor from a car in a junkyard, and never dumped out any oil or liquid in it. If the compressor had oil in it, and I added 30 oz. of R-134a, could that have overfilled the system?

har n · Accepted Answer

WHEN YOUR FILLING IT FILL IT SLOWLY AND WAIT A MINUTE NOW AND THEN AFTER YOU GIVE IT A SHOT. IT IS NORMAL FOR THE NEEDLE TO GO UP AND DOWN WHEN THE COMPRESSOR CLICKS ON AND OFF. WHEN YOUR FILLING IT SLOWLY BIT BY BIT YOU KNOW YOU HAVE ENOUGH WHEN THE CLUTCH CLICKS IN FOR 10 OR 20 SECONDS THEN CLICKS OUT FOR THE SAME. TIME MAY VARRY IN DIFFERENT CARS. IF ITS TO FULL IT MAY LEAK BECAUSE ITS TO FULL AND HIGH PRESSURE. IF ITS TO FULL THE COMPRESSOR CLUTCH WITH STAY CLICKED IN AND NEVER RELEASE. CAR LIKE THAT SHOULD TAKE 2 CANS OR MAY 2 AND A SMALL SHOT OUT OF A THIRD. IF ITS CORRECTLY FILLED AND STAYS FULL OVER NIGHT ITS NOT LEAKING

mdk68gto, ase certified m tech · Answer

high side pressure will change with ambient temperatures fan speed, the increased oil in that system will have an effect on total system pressure also.

Over filling AC system in '89 Taurus?

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