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Old 06-10-2000, 03:35 PM
jeffsr jeffsr is offline
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Chuck, how did you make the attachments to the evap core? When usin vacuum to check for leaks, the connections are the most important part of the test. Gotta be air and vac tight. I am assuming that the compressor is out of the car, otherwise you should check the entire system when connected. My local A/C Guru told me the system should hold 20 inches for an hour. But, he also likes to pressure test systems with stubborn leaks. He will pump them up with filtered, dessicated compressed air to about 150 PSI and watch for loss of pressure. I doubt this is a standard way of chasing leaks, but he says it works for him. Puts soapy solution on suspected area of leak and looks for bubbles. Says it's cheaper that using up R12 to find leaks.
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