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Did I loose oil ?

beginner on Sun July 18, 2010 2:46 PM User is offline

Year: 1998
Make: GMC
Model: 1500
Engine Size: 305
Refrigerant Type: R134
Ambient Temp: 110
Pressure Low: 0
Pressure High: 0
Country of Origin: United States

A sudden failure of the high side valve , caused the refrigerant to completely discharge in a geyser like fashion , through the high side valve . Do I need to add any oil before recharging ? If oil is required , can it be poured into the high side port when replacing the valve . On a side note , will pag oil deteriorate over time once it's opened ? Thanks .

Edited: Sun July 18, 2010 at 2:52 PM by beginner

TRB on Sun July 18, 2010 3:29 PM User is offlineView users profile

I would add back 1.5 ounces through the suction port.

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bohica2xo on Sun July 18, 2010 3:53 PM User is offline

What caused the spike in the high side? Without knowing the cause, and resolving it - you will just vent refrigerant & oil again.

Some PAG oil picks up moisture from the air after it is unsealed. Some does not. That would depend on the type of PAG you have.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

beginner on Sun July 18, 2010 4:59 PM User is offline


Thanks for both replies .


Quote
Originally posted by: bohica2xo
What caused the spike in the high side? Without knowing the cause, a

B.



Strange situation . The truck A C was cooling but not like it should . I simply removed the dust cap from the high side and walked away to get my gauges for a pressure test . The truck was not running , so of course the AC was off . Really weird it should happen like that .

bohica2xo on Sun July 18, 2010 5:04 PM User is offline

Huh. Not a common one that is for sure. I thought you meant the HPRV. Sounds like you just had a bad service valve, and the cap was maintaining integrity.

Yes, you can put the oil in through the port with the valve removed.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

beginner on Sun July 18, 2010 10:10 PM User is offline

Sorry to be a pest here but another problem . After replacing the high side , it turned out the low has problems too . I picked up a new low side valve but the old one seems to be part of the base . I don't know if I am right or wrong about that . some pictures ....


The valve that is there will not remove , even vice grips will just shear the outside metal off . I don't want to break it off . Is it part of the base ?





The old valve has a removable shader (sp) valve . The new does not .




This is the replacement they gave me , similar but not exact .

beginner on Wed July 21, 2010 11:51 AM User is offline

For anyone that might be looking for the answer , is the low port replaceable on this series GM system ..... It is not . Replacement is limited to the schrader valve .

bohica2xo on Wed July 21, 2010 12:36 PM User is offline

I really don't understand why you did not just replace the valve core in the first place. But I suppose the local supplier sold you what he thought was the right part...

GM has "changed their mind" on service ports & sealing washers (that general area of the system in your pictures) so often it resembles three blondes shoe shopping. Not surprising that you have one of five different types that they made that week.

Thanks for the pictures, we can add this to the knowledge base here.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

TRB on Wed July 21, 2010 1:21 PM User is offlineView users profile

WOW, are you even able to put the coupler on now?

Replaceable Valves: But obviously you need to make sure that you have a replaceable valve or not.

PRIMARY Valve GM, Ford and Chrysler HI SIDE 16MM x M12 x 1.5



Low Side 13MM PRIMARY SEAL PORT HNBR OCTAGONAL, Fits GM and Ford



-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com


Edited: Wed July 21, 2010 at 1:22 PM by TRB

beginner on Thu July 22, 2010 4:56 PM User is offline

Quote
Originally posted by: bohica2xo
I really don't understand why you did not just replace the valve core in the first place. But I suppose the local supplier sold you what he thought was the right part..

B.




You are on target . I actually did ask for the core valve but the guy behind the counter at NAPA told me that was wrong . He said they don't replace the core valve , they replace the whole assembly . When I returned to the job , I did feel that something was not right with what I was seeing but I figured the pro parts guy should know more then me . When you are a beginner you try to follow information from people with some experience . They also gave me a misfit high side assembly . I will not be buying AC parts at NAPA again .









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QUOTE

Thanks for the pictures, we can add this to the knowledge base here.

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If the pictures have value to the forum here are some more






beginner on Thu July 22, 2010 5:11 PM User is offline

Quote
Originally posted by: TRB
WOW, are you even able to put the coupler on now?
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I was careful to stay away from the front half of the port so the coupling contact surface was not damaged . When I hooked up the gauges and recharged the system , I was able to pull the vent temp down to 40 degrees with an outside temp of 110 degrees . I was more than satisfied with that .
....... Thanks to all for the help .

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