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Anyone have advice for a mystery A/C leak?

This is a discussion on Anyone have advice for a mystery A/C leak? within the General Help forums, part of the LSx Technical Help Section category; Starting in 2011, my A/C system stopped blowing cold. In prepartion for a trip to AZ (from WA), I took ...

  1. #1
    Senior Member Naaman's Avatar
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    Cayanne
    98 Z28 Vert M6

    Anyone have advice for a mystery A/C leak?

    Starting in 2011, my A/C system stopped blowing cold. In prepartion for a trip to AZ (from WA), I took it to the dealer to have it fixed. They said given my car's age (1998), it was probably going to have stay at the the shop a couple days, because it's never "just a leak" at that point. Anyway, they tested it, used the dye, let it run for 2 hours, etc, etc and the system held pressure.

    A few months later (when I decided it was time to use the A/C again), I was lothe to discover it was not blowing cold. Took it to a new friend who works at the dealer here, he tested it, it held pressure, so he recharged it. Days later it was not cold anymore.

    Some time later, I took it to school and worked on it with my teacher. We drained it, filled it with nitrogen; it held pressure. We filled it with dye. No leak. We used soapy water... no bubbles. We even used the little sniffer thingie. No leak. We replaced the low side Schroeder valve and over charged it to 2.1 lbs. Tested it. It blew 41 degrees with an ambient temp of 71.

    Held pressure for a few months... and then blew ambient air. Took it back to my friend at the dealer, and we went through it together in his stall. We could not find any leaks. We replaced the high side valve. Held pressure (as usual). After about a week, maybe a week and a half, it's blowing hot (ambient Phoenix summer air) again.

    I'm wondering what to do next... Anyone have some experience with anything like this?

    Help greatly appreciated.

  2. #2
    Senior Member JayTA98's Avatar
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    so everytime it blew ambient air it was checked with the pressure gauges and it showed that it was low on gas? Was the compressor running not running?

  3. #3
    Former Mopar Man 2002ssslp's Avatar
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    It's likely a leak from under the dash. Not a fun or cheap job.
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

  4. #4
    Senior Member Naaman's Avatar
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    Cayanne
    98 Z28 Vert M6

    Compressor still works.

    Interesting about it being a leak from under the dash. Even still, the leak would have to be amazingly slow to not register on the gagues, no? The system as a whole is supposed to be sealed.

  5. #5
    Former Mopar Man 2002ssslp's Avatar
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    Quote Originally Posted by Naaman View Post
    Compressor still works.

    Interesting about it being a leak from under the dash. Even still, the leak would have to be amazingly slow to not register on the gagues, no? The system as a whole is supposed to be sealed.
    May just be a pin hole. That's all it takes

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    Senior Member JayTA98's Avatar
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    yup it could be a pin hole like the other members suggested. you will not see a drop in pressure with a small hole like that. If is not an easy job to replace the evaporator inside the dash. are you checking around the orings?

  7. #7
    Smiles for 9.5 Years cammed goat's Avatar
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    ^^this. We had a Kenworth dump truck come to our shop for a recharge a few weeks ago. Came back yesterday for another recharge. My coworker had to change the O-rings.

  8. #8
    Senior Member Naaman's Avatar
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    O-rings, huh. Any idea how many O-rings are in our system? I have a 98.

    For those who do this for a living: if it were your shop, how would yo determine if the job was a success? Just give it back to me and "wait and see"?
    Last edited by Naaman; 06-18-2013 at 09:01 PM.

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    Senior Member JayTA98's Avatar
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    I did my compressor and replaced them all. I have an extra o ring kit. let me find it and I will post. I believe is around 7 o rings.

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    Spaz is My Mentor SMWS6TA's Avatar
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    have you tried the dye & florescent light yet?

  11. #11
    Senior Member JayTA98's Avatar
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    Quote Originally Posted by JayTA98 View Post
    I did my compressor and replaced them all. I have an extra o ring kit. let me find it and I will post. I believe is around 7 o rings.
    There are 7 aluminum o rings and a few rubber ones. You need the aluminum ones so I counted 7. They sell a kit for the whole a/c system for a specific vehicle. I think I pay like $10.

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    Experienced Old Fart jfl330's Avatar
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    Did you vacuum down the system each time before you recharged it?

    Replace the o rings, lube the rubber ones with pag oil before installing. Rather than charging it, pull a vacuum on the system (as if you were recharging it) and drive it a while to see if it holds the vacuum. If a system can't hold vacuum for a hour, it has problems.

    Jon

  13. #13
    Senior Member Naaman's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    have you tried the dye & florescent light yet?
    Yes. We even used the sniffer. I know that every time I worked on it, we fully vacuumed it each time.
    Lid, Throttle Body, LS6 Intake, Heads, Cam, Magnaflow, LS7 Clutch, SFCs, STB, Panhard Bar, Strano Springs, Hollow Sway Bars, Poly/Roto LCAs, Konis, MGW Shifter

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    Spaz is My Mentor SMWS6TA's Avatar
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    Did you check inside the car?

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    Time for an AC Delete

    RACECAR!!!!

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    Spaz is My Mentor SMWS6TA's Avatar
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    Not in AZ......too damn hot in summer

  17. #17
    Senior Member Naaman's Avatar
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    You know I HAVE been tempted to just rip the system out of there... But then my wife won't ride in the car with me... :P

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    Not in AZ......too damn hot in summer
    Drive faster and don't be a vagina.

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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by ls1camino View Post
    Time for an AC Delete

    RACECAR!!!!
    This...No more AC issues lol.

    Quote Originally Posted by Naaman View Post
    You know I HAVE been tempted to just rip the system out of there... But then my wife won't ride in the car with me... :P
    That's a problem? Jk But seriously I understand but mine rides with me still and I have no AC in mine.
    Last edited by 98TransAmWs-6; 06-21-2013 at 03:37 PM.
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  20. #20
    Senior Member Naaman's Avatar
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    LOL! Yeah, she'd ride Oct-May, anyway... It's turning out that my engine noise may be something way more serious than I thought, so I'll likely be putting this on hold for a while. We'll see...

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