Well I've got a 1993 r134a system in my 1993 944T....stock system not a retrofit. Well i managed to get a leak in the system over the winter and lost all pressure (push on schrader valve yeilds 0 pressure) on the low side. I added 12oz refrigerant and 3oz ester oil (premixed in a can) through the low side pressure port. Compressor now kicks in so i'm happy for that, but What PSI should it be at? I read between 25 and 45 PSI at this port as the compressor turns on and off and it cycles quite a bit....is that normal/ok....or do i need more refrigerant (I have no way of knowing how much refrigerant was in the system except that no pressure was there prior to adding the can)
Thanks
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