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finding leak in evacuated system?

dtom4 on Sun August 02, 2009 9:45 PM User is offline

Year: 1993
Make: Saab
Model: 900
Engine Size: 2.1
Refrigerant Type: r12
Ambient Temp: 80
Country of Origin: Sweden

Bought the car a few years ago and the ac gradually started losing its cooling over the course of a couple of years. Just got around to checking it out and system had virtually no pressure. Decided it was a good time to open it up so replaced the reciever dryer and expansion valve and all the orings I could reasonably get to. Matched the orings up and smeared some nylog and figured things would hopefully be ok. Pulled vacuum for 45 minutes but it wouldn't hold. Lost all vacuum in about 20 minutes after shutting off the pump so theres a huge leak somewhere.
What is the best method to find the leak source? Do I need to pressurize it with some r12 and use a sniffer or light? TIA

Dave

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Dave T.

Chick on Sun August 02, 2009 9:53 PM User is offlineView users profile

If you have a sniffer, use it, check the compressor and the pressure relief valve, it may have blown at one time and not reseated.. Also all the connections you opened.. You can pressurize with R134a if you want, just don't run the compressor and remove it before pulling your vacuum again.. a leak that big shouldn't be to hard to find, check the condenser also for a stone hole, corrosion etc...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

dtom4 on Mon August 03, 2009 12:25 PM User is offline

Thanks Chick...I'll give it a shot. Being able to use r134a to find the leak is a big help.

Dave

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Dave T.

Prospeeder on Mon August 03, 2009 7:34 PM User is offlineView users profile

while its under a vacuum, or trying to pull the vacuum, use a stethoscope around every connection and stick it into the evap box, i have done that a few times in class to find leaks.

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1990 Pontiac Turbo Grand Prix
1990 Pontiac 6000 LE V6
Both have R12 A/C

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