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volume of R-134a

I have my a/c system working. Saturday was very hot and the clutch on the compressor was cycling off the high 300 psi pressure switch and the air was comming out of the dash.... not so cold. I returned home and ran hose water over the condenser and it started blowing cold again. Who knows how much R134a is enough? I have about 3 cans in my system.To me 300 psi is a lot of pressure. Is this normal?
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