Quote:
Originally Posted by porschyard
While I am not a refrigeration engineer I have been working on strictly Porsche’s for 40 + years and mainly on G series cars. I have repaired/replaced 100’s of A/C systems and as I said earlier this statement is truly baffling. As was mentioned earlier the moisture that will be in the system after that period of time of dormancy would absolutely require a new drier and evacuation as the moisture will cause all kinds of nasty long term problems like acid formation and sludging of the oil and short term issues such as freeze up of the expansion valve.
But air is a non condensable and not removing it by a vacuum causes immediate problems one being very high head pressure which will be the highest at the discharge hose from the compressor to the rear condenser (coincidentally the hose that burst) and as you mentioned the hose failed after only a partial charge of the alternative Freon.
The manufacturers advice of not pulling a vacuum goes against not only everything I have learned about refrigerant systems but also 40+ plus years of experience.
I am glad to hear you are going to pull a vacuum on the next go round but I would highly recommend a drier also.
Richard
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I ONLY work on my cars. AC is important to me. I learned from my father in law. And a lot from Pelican and trial and lots of error. I have to agree 100% not pulling a vacuum, and leaving the old receiver-dryer in place is just asking for problems for the reasons you mentioned.
Any vendor that states no vacuum is needed, is selling snake oil in my opinion. Just my opinion, I have been wrong before. But my AC simply works in the hottest temps and after a full day of driving in triple digit temps.