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recharging air conditioner

Heating and Ventilation

Model: 911SC, Year:1980, Mileage:68000, Type of use:Street use only
My original R-12 ac has been converted to an R-134 system. I do not use the ac too much and it probably leaks some refrigerant. May I top off the system with some R-134 and stop leak purchased from the auto store? If so, when I attach my refrigerant can/hose to the fitting is there a valve on the compressor that needs to be opened? If so what does it look like and where is it located.

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