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  1. #11


    Quote Originally Posted by Quikfire View Post
    That's the second time someone has mentioned AC refrigerant. .
    That was me.

    Quote Originally Posted by Quikfire View Post
    Is the refrigerant slightly oily and would it dry like water? .
    Yes and yes.

    Quote Originally Posted by Quikfire View Post
    Where would I start to chase down an AC leak like that? .
    There should be some AC lines, going to the fire wall above that area. Wipe them with a paper towel, look for wetness.

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

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  3. #12


    Aye Aye Captain. Ill dig into that in the morning.
    Chevrolet Avalanche 1500 Z71
    5.3 Liter

  4. #13


    Quote Originally Posted by Quikfire View Post
    Aye Aye Captain. Ill dig into that in the morning.
    Have fun, haha

  5. #14
    Jr. Mechanic
    Join Date
    Apr 2013
    East Central Iowa


    I noticed that it does have a slightly green tint in the pic. Have you looked at the heater hose fitting in the rear of the intake passenger side? Just a thought,I replaced quite a few.

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  7. #15


    A little update. Yesterday I dove into the burb. No obvious AC leak that I could notice. I found nothing to make me think the water pump was leaking. I looked at firewall and found nothing leaking either. I could not find the heater hose fitting on the intake however and that would make a little sense from a placement standpoint. The freeze plug looks fine. A neighbor suggested to get a pressure test of the radiator done, which I plan on doing tomorrow. Now there is no leak under the burb today, Stumped, but thanks for all the suggestions!

  8. #16


    At this point, I would wipe it dry and go for a beer.

    Check it every couple of days and worry about it if it comes back (it might be the kid down the street playing an early Halloween trick).

  9. #17


    I would pressure test it. If you had a leak it did not fix itself. I had a very slight leak from the gasket on my water pump. It sat in my mother in laws driveway for 2 days and I noticed a spot about the size of a dime under it. I crawled under it but could not find a leak. I got it home and pressure tested it. As soon as I hit 10 psi it started pouring out of the gasket area. When ever you think there is any kind of coolant leak it is best to just pressure test it. you can rent them for free at a parts store. It would stink to think you have a leak that miraculously stopped and you get stranded 50 miles away from home because it turned out to be a loose hose clamp or failing hose.

    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,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  10. #18


    Take a GOOD close look at your intake manifold

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