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Service port fitting

WyrTwister on Mon April 01, 2013 3:29 AM User is offlineView users profile

Year: 1996
Make: Chevy
Model: Lumina
Engine Size: 3.1L
Refrigerant Type: R134a
Ambient Temp: 80
Country of Origin: United States

Worked on my wife's car , Saturday .

This car had been parked for 3 - 4 years . We put it back in service around Christmas .

At that time , I replaced the compressor pulley bearing .

Well , it is getting warm enough for her to want A/C on the warm days .

First thing , I was going to replace the Schrader valves in both service ports . I have the long skinny tool to unscrew the valve and a package of valves purchased at a refrigeration wholesale distributor .

Could not get the high side fitting to cooperate . I finally got into a position where I could get a better look at ht inside of the fitting . It seemed to be made so only the " stem " of the valve " stuck up " ?

The fitting looked to be 2 piece . Tried a wrench holding the base of the fitting and a socket

The low side fitting was what I expected . Removed the old valve , lubed a new valve with PAG oil and screwed it in .

I then vacuumed the system down , checked for leaked and then gassed it up . A/C blowing cool , now .

Can anyone please , give me any information on this style of high side fitting ?

Thanks ,
God bless
Wyr

AutoCool on Mon April 01, 2013 8:16 AM User is offline

Hi, the service port fitting on your cars high side is called a "GM primary seal". It is removable and replaceable. There is a special eight-point socket to remove/replace it. (I suppose originally intended to be one of those dealer-only tool tricky tricks!) Use a wrench on the lower portion so you don't twist off the female portion on your AC line. Be sure to oil the fitting oring if you replace it.

Forum sponsor sells this as part 35-50021. Good luck with the car.

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