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  1. #11

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    True, the interior thermostat can cause a problem like you suggest. Note, this is only a problem with the trucks that have the automatic HVAC systems, the system where the interior temp can be set.

    Sometimes removing and cleaning the little fan will fix the problem.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  2. #12

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    Not to burst your bubble, but just note that if the refrigerant is low, it cane out through a leak somewhere. Without fixing the leak, the recharge will "leak" out as well.

    Now, it may be a very slow leak and last for a while, but buy a second can, you will probably need it.
    I put in three cans and everything started looking lovely. The compressor stayed on for awhile. Gauges showed I needed some more so I let it idle for a while and it eventually it cut off the compressor again. Well when I took the low side cap off it was leaking pretty good. Apparently the schraeder valve has a leak and I must have made it worse. So I have ordered a valve change tool and will do that job later in the week. Until then I used an o-ring under the cap to slow the leak.
    I'll keep yall posted. In the meantime I'll hope that the original leak was actually the low side schraeder valve.

    Also what part of Louisiana you from?
    Baton Rouge. And you?

    Thanks for the help guys.

    BC/TB

  3. #13

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    Quote Originally Posted by BuffaloChip View Post
    I put in three cans and everything started looking lovely. The compressor stayed on for awhile. Gauges showed I needed some more so I let it idle for a while and it eventually it cut off the compressor again. Well when I took the low side cap off it was leaking pretty good. Apparently the schraeder valve has a leak and I must have made it worse. So I have ordered a valve change tool and will do that job later in the week. Until then I used an o-ring under the cap to slow the leak.
    I'll keep yall posted. In the meantime I'll hope that the original leak was actually the low side schraeder valve.



    Baton Rouge. And you?

    Thanks for the help guys.

    BC/TB
    St. Amant. I'm stationed in Virginia though. Miss it there very bad. Heard there was some real bad weather



    If at first you don't succeed, get a bigger cheater bar.

    Current:
    1999 GMC Sierra SLT Z71 | 5.3 "Vortec" | Spectre "Cold Air Intake" | TransDapt TBS | Hypertech 30005 Tune | 2005 Chevy Tail Lights | Denali headlights | Grill Mounted Fog Lights | AWS Bug Shield | 265/70/16 Futura Scramblers | Boss HD Speakers | 2005 Overhead Console | Flowmaster Super 40 mufflers 2N1O | Mostly stock-ish
    Future:
    Bigger Amp Alternator | Electric Fans | Transmission Fluid cooler | Paint (Halfway there)| Interior Restoration/Upgrade with newer model parts | Window Visors (In channel) | Tint | Low-Profile Tool Box | LEDs throughout stock cab locations (68% Done) | And whatever is spurr of the moment
    CVN-69 "IKE-ATRAZ" AIR/V-2 Gear Dawgs

  4. #14

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    Quote Originally Posted by BuffaloChip View Post
    I put in three cans and everything started looking lovely. The compressor stayed on for awhile. Gauges showed I needed some more so I let it idle for a while and it eventually it cut off the compressor again. Well when I took the low side cap off it was leaking pretty good. Apparently the schraeder valve has a leak and I must have made it worse. So I have ordered a valve change tool and will do that job later in the week. Until then I used an o-ring under the cap to slow the leak.
    I'll keep yall posted. In the meantime I'll hope that the original leak was actually the low side schraeder valve.



    Baton Rouge. And you?

    Thanks for the help guys.

    BC/TB
    I think that it is not possible to service those valves, at least on an 04 you could not. Autozone sells an adapter that just screws on over the old port. It has a new valve in it. It is faster and cheaper than replacing the lines.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  5. #15

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    Quote Originally Posted by Pikey View Post
    I think that it is not possible to service those valves, at least on an 04 you could not. Autozone sells an adapter that just screws on over the old port. It has a new valve in it. It is faster and cheaper than replacing the lines.
    Now that's good info

  6. #16

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    Xs3 what pikey said. That man is a genius

  7. #17

    Default

    St. Amant. I'm stationed in Virginia though. Miss it there very bad. Heard there was some real bad weather
    From St Amant you know about the weather. Recently just a lot of rain but rough weather is a frequent item around here. You in the military?


    I think that it is not possible to service those valves, at least on an 04 you could not. Autozone sells an adapter that just screws on over the old port. It has a new valve in it. It is faster and cheaper than replacing the lines.
    th

    I'll check on that. Got a friend who works at AZ so I get my parts there mostly.

  8. #18

    Default

    Quote Originally Posted by BuffaloChip View Post
    From St Amant you know about the weather. Recently just a lot of rain but rough weather is a frequent item around here. You in the military?


    th

    I'll check on that. Got a friend who works at AZ so I get my parts there mostly.
    Yup in the Navy since last September of last year. I was just home in July when we came back from deployment.

  9. #19

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    Well I got a schrader valve changer and didn't loose any refrigerant doing the replacement so things are moving along. (AutoZone does not have the screw on adapter any more.)

    But I don't get really cool air just medium cool. Anybody know what the high and low side pressures should be on a 85-90 degree day??

    It may have leaked out too much 134a to cool properly even on the road.

    Thanks

  10. #20

    Default

    Hello again - RayVoy, rileyjr16 and Joe Daddy - thanks for your replies here. It all helped.

    Just want to update you guys on my progress so far on my Yukon XL AC.

    The low side schraeder valve developed a serious leak after I hooked up a gauge and added 134a. It leaked down quite a bit so I bought a Mastertool valve changer and replaced the valve and the leaking stopped. I do not know yet if the valve was the only leak. Waiting to see.

    It was fairly straight forward to add more 134a and bring the pressure up to 50/250 and get cooling again. Everything seems to be working OK now and my vent temp gets down to about 39-40.

    However itís the possibility of another leak, maybe the original leak that I am dealing with so I have an eye on the vent temp a lot to see it starts creeping up. Itís just a waiting game now but it is cool again and thatís a blessing.

    So now my brakes are squeaking. Itís always something.

    Thanks again

    Tim B
    aka BuffaloChip

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