Coolant Leak 2001 Tahoe 4.8L

Discussion in 'Chevy Tahoe Forum (GMC Yukon, Cadillac Escalade)' started by nascar1, Sep 26, 2010.

  1. nascar1

    nascar1 New Member

    I have a dripping coolant leak and can't find it. Looking under the car, it seems to be dripping off the starter area. Looking at the top of the engine back near the firewall, the heater hoses go into the firewall. I see no leaks there. There are some hoses that branch off the heater hoses and go down the firewall and disappear. Don't know what those hoses are or where they go from there but I know the heater hoses are not leaking at the firewall.

    The leak is a dripping leak, maybe losing a quart a week but would hate to have to pull the whole engine out to find it.

    Anyone have any ideas? Also, anyone have any thoughts on using stop leak?
  2. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Try a mirror and flashlight to look behind the engine near the firewall.
  3. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    NEVER use stop leak, exept as a last resort to get you out of the woods or home... It will plug just about everything up, radiator, heater core etc..
    Also it sounds like you might have a head gasket leak on the rear of the pass side head.. But as Silveradotrailblazer mentioned try getting in there with a mirror.
  4. nascar1

    nascar1 New Member

    Well, I still haven't located the leak. I can't get a mirror back in behind the passenger side head but I think I'll get the engine warm, put on a glove and see if it's wet when I pull it out.

    I am still wondering what those lines are that come off the heater hoses just before they go into the firewall. Could it be hoses for an auxiliary unit to get heat to the rear of the Hoe ?

    Also, thanks for the comments. I WILL NOT USE STOP LEAK !!
    Last edited: Oct 4, 2010
  5. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Those are for the rear heat if you have it. and i wasnt yelling at you persay i was just trying to emphasize it since it is horrible stuff except in emergencies.

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