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Air conditioning micro leak

Gfgalla on Sun May 26, 2013 9:38 AM User is offline

Year: 2000
Make: Gmc
Model: Jimmy
Engine Size: 4 L
Country of Origin: Canada

My gmc jimmy has a very small leak. When I top it up it works fine for about 2-3 weeks then gets progressively worse. However I noticed that after a winter or a long period of time the static press stays at 30 psi and doesn't drop any lower suggesting there is no leak. Any suggestions. I haven't done a leak test yet.

WyrTwister on Sun May 26, 2013 3:19 PM User is offlineView users profile

First thing I would look at would be the schrader valves . Not uncommon for them to develop leaks .

Also , look for evidence of oil leaking . It will have a tendency to " gather " dirt , making it easier to see .

Try buying a can of freon also containing dye . Old school is red dye . New school is a yellow / green florescent die .

Someone makes a kit with a " black lite " and yellow tinted plastic " glasses " .


God bless
Wyr

GM Tech on Sun May 26, 2013 5:58 PM User is offline

Static pressure of 30 (at 70 degf) means you've lost 95% of your refrigerant- so saying no leak is wrong- you have a leak- most likely compressor belly. Is it oily?

-------------------------
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......

mk378 on Sun May 26, 2013 7:29 PM User is offline

Or the shaft seal.

Look in the service ports for a yellow / green color to see if you already have UV dye in the oil. Many cars are charged with dye at the factory. If there was dye in the system, you can use a black light to look for it.

Edited: Sun May 26, 2013 at 7:30 PM by mk378

GM Tech on Sun May 26, 2013 8:37 PM User is offline

Since he has an HT-6 compressor- built after 1996- he already has a double lip shaft seal- so I don't usually see double lippers leak--also dye on GM cars went in OEM in Model Year 2002- OP is 2000- so dye would have had to been added at service for it to have it.

-------------------------
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......

WyrTwister on Sun May 26, 2013 10:15 PM User is offlineView users profile

Did he say how many miles on the vehicle ?

God bless
Wyr

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