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'83 928S A/C repair

Heating and Ventilation

Vehicle Information: Year: 1983; Engine (size, modifications): 4.7L; Total Mileage: 172000; Transmission type: Autotomatic;

The A/C seemed to work when I first bought the car in July of '07, but it worked only a few times. I didn't bother much with it over the summer, but now it is winter and I thought that I would have a look at it.I thought first that I should figure out if the system has been converted to R134. How would I determine this? Also, what would be my steps in diagnosing the problem(s) from there?

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