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ac high pressure valve leaking

This is a discussion on ac high pressure valve leaking within the Technical / Maintenance forums, part of the General Discussion category; so about a week ago I turned on my ac and the second I hit the ac button I herd ...

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    Registered User thepopeis1's Avatar
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    ac high pressure valve leaking


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    so about a week ago I turned on my ac and the second I hit the ac button I herd a pop, and had about 10 seconds of ac then nothing. When I got home I opened the hood and saw oil poring out of the high pressure servicing valve. I hooked up my pressure gauge today to the low pressure and its at 0psi.

    so I guess the first thing is to replace the high pressure valve. where do I find one. I got the old one to unscrew, but I cant seam to find a new one for my truck. are they universal? is there a technical name for it that I would have better luck finding it under.

    I know its a odd time of year, but my grandpa used to work for a ac company and said if I let it set the seals could go bad. plus I use it sometimes when my window fogs up real bad in the winter.
    Last edited by thepopeis1; 09-28-2010 at 10:15 PM.
    1998 GMC K1500 Z71 Flowmaster Super 40, E Fans, LMC Truck lighted front bumper.

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    Registered User thepopeis1's Avatar
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    Re: ac high pressure valve leaking

    sorry I guess its impotent to tell you guys this is my 98 gmc k1500 5.7

    its the vavle on top of the ac compressor. there is 2. a low pressure that faces sideways, and a high that faces strait up. I need to replace the high. where can I find one.
    1998 GMC K1500 Z71 Flowmaster Super 40, E Fans, LMC Truck lighted front bumper.

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    GMC RULZZ NEUMANNZZ's Avatar
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    Re: ac high pressure valve leaking

    look up part number 36655 on the autozone website. should be a pic of it.
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    Registered User thepopeis1's Avatar
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    Re: ac high pressure valve leaking

    Quote Originally Posted by NEUMANNZZ View Post
    look up part number 36655 on the autozone website. should be a pic of it.
    thanks for the replay. that is the high pressure switch. I need the valve. they have black caps on top of them. you add refrigerant to the low pressure side. Im trying to find a picture of one
    1998 GMC K1500 Z71 Flowmaster Super 40, E Fans, LMC Truck lighted front bumper.

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    Loves GMT400 haters someotherguy's Avatar
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    Re: ac high pressure valve leaking



    Can't remember if it's replaceable or not - without replacing the whole manifold/hose assembly. I *think* it is, and the slit you see near the bottom of the fitting is the gap where it's threaded on, but I could be totally wrong and it may be a one piece setup. Doesn't have a typical schrader valve core; it's the ball seat type that the core is not replaceable.

    Richard

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    Registered User east302's Avatar
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    Re: ac high pressure valve leaking

    Believe you need part #7 on the diagram below:



    GM Part number 52458184

    Link to diagram with table of part numbers...

    http://www.compnine.com/index.php?u=...09&grouptype=B

    It looks like an inexpensive part. To make sure you get the right one, I'd confirm with a dealer and get it from them.
    1998 Chevrolet Z71, 350 auto
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    When I die, I want to go peacefully in my sleep like my grandpa, not yelling and screaming like the passengers in his car.

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    Registered User thepopeis1's Avatar
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    Re: ac high pressure valve leaking

    Quote Originally Posted by someotherguy View Post
    Can't remember if it's replaceable or not - without replacing the whole manifold/hose assembly. I *think* it is, and the slit you see near the bottom of the fitting is the gap where it's threaded on, but I could be totally wrong and it may be a one piece setup. Doesn't have a typical schrader valve core; it's the ball seat type that the core is not replaceable.

    Richard
    I got it to unscrew. the 2 nuts u see there with a gap do not unscrew. but the valve it self did unscrew from the nuts. I did not take it all the way out since I wanted the least amount of air possible in there.

    I may have to it take somewhere later to have it evacuated, and refilled. From my experience when I have something broken in a car ac system. they want to replace every thing for some reason and they want like $1,200 to fix it when all it needs is a $10 part. and a refill.
    1998 GMC K1500 Z71 Flowmaster Super 40, E Fans, LMC Truck lighted front bumper.

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    Registered User thepopeis1's Avatar
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    Re: ac high pressure valve leaking

    Quote Originally Posted by east302 View Post
    Believe you need part #7 on the diagram below:



    GM Part number 52458184

    Link to diagram with table of part numbers...

    http://www.compnine.com/index.php?u=...09&grouptype=B

    It looks like an inexpensive part. To make sure you get the right one, I'd confirm with a dealer and get it from them.
    THANK YOU VERY MUCH!!! I googled the part# and that looks like thats it. I will confirm with my dealer
    1998 GMC K1500 Z71 Flowmaster Super 40, E Fans, LMC Truck lighted front bumper.

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    Loves GMT400 haters someotherguy's Avatar
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    Re: ac high pressure valve leaking

    Quote Originally Posted by thepopeis1 View Post
    I got it to unscrew. the 2 nuts u see there with a gap do not unscrew. but the valve it self did unscrew from the nuts. I did not take it all the way out since I wanted the least amount of air possible in there.
    Cool. I was pretty sure it was replaceable. Where did you get it to come apart, between where the round part of the valve meets the nut-shaped part below?

    East302 - thanks for posting the part #. Looks cheap enough to just get at the dealer instead of mail-ordering it.

    Richard

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    Re: ac high pressure valve leaking

    i have a 94 leaking from the high side, good info thanks for posting!

 

 

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