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A/C dye injection

Dale7905 on Fri April 16, 2010 3:07 PM User is offline

Year: 1991
Make: Lincoln
Model: Towncar
Engine Size: 4.6L
Refrigerant Type: R-12
Pressure Low: 0 psig
Pressure High: 0 psig
Country of Origin: United States

Hello All.

My Lincoln Towncar a/c has a refrigerant leak. When I pull a vacuum on the system it is evident the leak is relatively slow, but over night it will drop from about 30 psig to 8 psig. There is no obvious evidence of a leak around the various hose or compressor connection so I plan to inject some dye to see if that will help me isolate the leak.

I'd appreciate any suggestions/comments on the various ways to inject the dye.

I have an a/c manifold and some other a/c servicing equipment, but I don't have a special dye injector.

An individual I talked to said a special dye injector was not necessary and to just pull a slight vacuum and pour a 1/4 ounce of dye ( the recommended amount for the approximately 2 lbs of R-12 that goes in the a/c) and let the vacuum pull the dye into the low side of the system. Only problem with that is that the dye also coats the inside of the hoses and stays a long time.

I suppose its is also possible to disconnect the pressure sensor switch on the accumulator and remove the schraeder valve and inject the dye with a syringe when the system is at 0 psig. That's just a guess at the moment.

Any comments/suggestions would be appreciated.

robs on Fri April 16, 2010 5:44 PM User is offlineView users profile

53351 is our Professional Leak Detecting Kit that comes with a dye injector.

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