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Coolant disappearing, Head gasket diagnostics?

Discussion in '04.5-05 LLY' started by Ed HD, Feb 7, 2016.

  1. Ed HD

    Ed HD Formerly: Dad's 05 LLY

    3,083
    251
    Jul 6, 2008
    Lakeville, Minnesota
    Mom has been driving the Duramax lately, the other day she got in to a Low Coolant message, they checked it and added about a quart. What's the best way to test for a leaking HG? Pressure test? Could the WP be leaking? They're telling me that it's not leaving anything on the floor in the shop , but with it being winter it could easily be getting lost in the snow dripping. I need to get in and replace the P/S pump (see other thread, wanted to keep these separate) and I know you gotta pull the HB, but it'd be easier to do it all at once.
     
  2. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

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    May 9, 2008
    ZEPHYRHILLS FL
    The best way I have found to check the water pump is to look for the orange all over under the weep hole and the oil pan behind it. Its not uncommon for water pumps to leak sporadically. Leak alot, then stop, then leak again. Head gaskets normally leave you with a pressurized cooling system after it sits overnight.
     
  3. Ed HD

    Ed HD Formerly: Dad's 05 LLY

    3,083
    251
    Jul 6, 2008
    Lakeville, Minnesota
    Gotcha. Is there a UV dye you can add to the coolant? Or is that a bad idea?
     
    tanman_2006 likes this.
  4. 79jasper

    79jasper Active Member

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    Nov 10, 2013
    El Paso, TX
    Yeah, most parts stores have it. Might take quite a bit of it though.

    Sent from my SAMSUNG-SM-G890A using Tapatalk
     
  5. Will L.

    Will L. Well-Known Member

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    2,867
    Jan 25, 2013
    Boulder City Nv
  6. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

    8,345
    1,452
    May 9, 2008
    ZEPHYRHILLS FL
    Napa carries the dye, problem is dexcool is so slick itvtends to just run right off. It does tend to leave orange traces behind if it leaks when hot. Also you need to check the turbo cooling hoses. Theres one back behind the fan idler that is known to leak, and is a pain to change out.
     
  7. tanman_2006

    tanman_2006 Just a farm kid...

    5,387
    427
    Feb 15, 2010
    Seiling, Oklahoma
    Also check the heater hose quick connects on the firewall top pass side of engine
     

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