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
I would add back 1.5 ounces through the suction port.
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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.
Thanks for both replies .
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.
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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.
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 .
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 .
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.
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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.
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
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