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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
He doesn't need to be a Porsche guy.
R134 AC systems are basically the same in all cars, just most newer cars use a fixed orifice just before the evaporator instead of an expansion valve and the 911 system NEEDS to be evacuated for at least 3hours nonstop to boil and suck out all the moisture in it's 40+ feet of AC lines throughout the car and the front condensor and the evaporator which are in the front part of the car so a good complete evacuation takes a while.

Be sure to back purge all the air out of the manifold gauges, and then purge the air out of the yellow hose before charging. Do that by partially unscrewing the yellow hose from the manifold gauges and letting air escape until refrigerent is coming out. The threads the yellow hose screws onto is partially slotted just for this purpose.
There is a sequence to this and it along with the math and pressure table relating to ambient temperature are just some of the subtleties to a proper charge.
Old 03-30-2010, 01:11 PM
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