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Determining leak area and needs

Bob1 on Tue July 21, 2009 11:50 AM User is offline

Year: 1995
Make: Jeep
Model: Grand Cherokee
Engine Size: 5.2 V*
Refrigerant Type: R134
Country of Origin: United States

A single can of recharge works fine, but only lasts 2-3 weeks.

After adding florescent dye to recharges twice, the only leakage I can detect with the blacklight is some minor glowing on the minor oxide bumps on my compressor and a few tiny dots behind it on the intake manifold. I'm assuming that the compressor shaft seal is the culprit.
I've carefully checked under the car as well including the garage floor and any possible drain area. I've also wrapped some suspected line couplings with rags before doing dye tests to capture leaking dye, with negative results.

Do you feel this is enought evidence to go forward and change the compressor and other hardware such as the accumulator?

Thanks, Bob

GM Tech on Tue July 21, 2009 11:52 AM User is offline

Are you using the black light and UV glasses to check for dye? Also low light, like at night works best.....have seen a big difference if not using the UV glasses...

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

knightgang on Tue July 21, 2009 11:56 AM User is offline

Have you checked the low and high pressure outlets? Sometimes the ball valves in those ports do not seal properly and will leak. Putting the cap on is not always a sure method of stopping the leak there either. This is just a thought.

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