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Gmc ac issue #741760
October 19th 2018 7:59 pm
October 19th 2018 7:59 pm
Joined: Aug 2017
Posts: 5
Sewell, NJ
S
Scubasteve Offline OP
stranger
Scubasteve  Offline OP
stranger
S
Joined: Aug 2017
Posts: 5
Sewell, NJ
I have a 93 gmc shorty. Today i bought and installed new seals on the back of the compressor where the hard lines mount. When i went to charge the lines its still leaking there. I cleaned both surface areas before installing and double checked the seal part number. I am scratching my head now, any ideas on whats causing this?

Re: Gmc ac issue [Re: Scubasteve] #741761
October 19th 2018 10:13 pm
October 19th 2018 10:13 pm
Joined: Sep 2005
Posts: 8,676
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,676
Georgia, USA
Are you sure it's the lines/connection that's leaking?
There is a plug (held by a cir-lock clip) in the rear of the compressor that has a o-ring seal. If you have a rear brace that connects the compressor to the intake manifold that plug will be hiding under it. Take out the two bolts holding the brace and you'll find it. (It will look similar to a small freeze-plug under the cir-lock.) I have had this spot leak many times before and drive an electronic leak detector nuts.

Last edited by CatFish; October 19th 2018 10:17 pm. Reason: kant spel


How come you never see a headline saying ‘Psychic Wins Lottery?


Re: Gmc ac issue [Re: CatFish] #741767
October 20th 2018 10:29 am
October 20th 2018 10:29 am
Joined: Aug 2017
Posts: 5
Sewell, NJ
S
Scubasteve Offline OP
stranger
Scubasteve  Offline OP
stranger
S
Joined: Aug 2017
Posts: 5
Sewell, NJ
It was leaking around that area. I do remember seeing what looked like a small plate bolted to a brace at the bottom rear of the compressor. Ill check it out hopefully thats it. Thanks

Re: Gmc ac issue [Re: Scubasteve] #743085
November 23rd 2018 7:55 pm
November 23rd 2018 7:55 pm
Joined: Sep 2009
Posts: 1,051
Bristol, TN
B
Bullet Offline
old hand
Bullet  Offline
old hand
B
Joined: Sep 2009
Posts: 1,051
Bristol, TN
Those compressors are notorious for developing a leak between the front half of the case and back half. Try to run your hand under the bottom of it in the center and see if there's any oil. There is a different design compressor made to replace it, I got mine at O'Reilly's, it was called a "problem solver" at the time.
Here is a couple links, the first is the style that develops leaks, the second is a new one piece case design.
https://www.oreillyauto.com/detail/...r-new/88969/5777370/1993/gmc/g1500?pos=0
https://www.oreillyauto.com/detail/...r-new/58969/5777274/1993/gmc/g1500?pos=1


'85 GMC Shorty
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Re: Gmc ac issue [Re: Bullet] #744097
December 29th 2018 11:43 pm
December 29th 2018 11:43 pm
Joined: Jun 2018
Posts: 9
Okc ok
T
thevolvokid Offline
stranger
thevolvokid  Offline
stranger
T
Joined: Jun 2018
Posts: 9
Okc ok
Originally Posted by Bullet
Those compressors are notorious for developing a leak between the front half of the case and back half. Try to run your hand under the bottom of it in the center and see if there's any oil. There is a different design compressor made to replace it, I got mine at O'Reilly's, it was called a "problem solver" at the time.
Here is a couple links, the first is the style that develops leaks, the second is a new one piece case design.
https://www.oreillyauto.com/detail/...r-new/88969/5777370/1993/gmc/g1500?pos=0
https://www.oreillyauto.com/detail/...r-new/58969/5777274/1993/gmc/g1500?pos=1


Sorry to hi-jack the thread a bit, but does the 58969 (second link) fit in a 95 Chevy G20 application? I'm thinking it would but would love some insight on it.

Re: Gmc ac issue [Re: Scubasteve] #744098
December 30th 2018 7:04 am
December 30th 2018 7:04 am
Joined: Mar 2011
Posts: 329
NY
J
jcd74 Offline
enthusiast
jcd74  Offline
enthusiast
J
Joined: Mar 2011
Posts: 329
NY
If you can find, buy, borrow the equipment. Use a good set of gauges, and a vacuum pump, Pull a vacuum in the system, while it is pulling down tap on the compressor now and then to get any gas in the oil out (it will ruin the test). Pull it down to -28 on the low side gauge and let it sit for 24 hours. If it holds no leaks! While a pain in the ass, it's worth it to pull the compressor so you can look for problems. If you take it out change the oil The plug that Catfish mentioned. Keep in mind you have to use right oil for what ever gas you decide to use, the same goes for the seals on the refer lines at the compressor. I got a new compressor for my 89 and it came with a mixed bag of seals. They varied from gas used to type of refer line block it has.


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