1993 Chevy Blazer leak detection

Tiny
JEFF ZWAR
  • MEMBER
  • 1993 CHEVROLET BLAZER
Air Conditioning problem
1993 Chevy Blazer V8 Four Wheel Drive Automatic

I have pressure tested the system to 75psi with nitrogen for 15 minutes with no pressure loss, and no visible leaks using soapy water solution. But, when pulling vacuum, it loses 6 inches in five minutes and is down to 10 inches overnite. Any ideas?
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Tuesday, July 15th, 2008 AT 3:01 PM

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Tiny
DOCFIXIT
  • EXPERT
Sometimes when you presurize a system oil can be pushed into a leak and seal it and in the evaporator thin alluminum can seal. Now with a vaccum you pulling down and will open leaks. My experience with GM is if you can't find leak then it is the evaporator.
If you can get a halogen leak detector put a can freon in with your nitrogen let set hour turn fan on low with detector wand in vent I bet she goes off.
Good luck
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Tuesday, July 15th, 2008 AT 3:30 PM

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