Question about 2006 Hummer H1

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1995 H1 Problem

Hi There,
I trust this finds you well. My name is Ray and I am one of only two Hummer H1 owners in South Africa. As you can imagine there are no service centres here and I import all my bits and pieces to perform maintenance. Usually the servicing of my vehicle is pretty simple, however, I have had a recent water (coolant) leak that has baffled me. PLEASE COULD YOU HELP. The leak is coming from a pipe that sits inside the blower housing on the passenger side and it drains the coolant tank every time the engine runs! I have photos that I could send. It is not the overflow from the water tank, but rather some sort of overflow for the air-conditioner. The worst of the problem is that I can't open the plastic housing behind which the suspect pipe sits. Any ideas? I would really appreciate the help as I can't get H1 help locally!

Raymond du Plooy

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  • hummerray Nov 09, 2008

    Thanks for the help. I did find that to be the problem after all. The guys at the hummer forum as well as yourselves have enlightened me. Much appreciated.




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I have a coolant leak also that is coming from the heater core - leaking into the passenger side. I had the heater core box cover removed and need to replace the heater core. The box/cover that in came in was pretty beat up. I need to find a new box in order for the heater core to work. Does anyone know where to find such a part. I have a 1996 H1 Hummer. Thanks. Max....

Posted on May 25, 2009

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If you are needing to work on your hummer yourself you might wanna pick up the service/parts manual. I bought mine off ebay on CD-ROM and it made everything a hell of alot easier. Here is the link to the manual i bought. or just search for Hummer Repair Manual on ebay. Its a must have. I feel your pain on fixing these damn trucks.


Posted on Nov 09, 2008

  • jasonwest82 Nov 09, 2008

    Oh and the problem you are having is a bad heater core. They go bad and spew sweet smelling coolant into the cabin on the passenger side.


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Hi raymond,

it could just be the overflow of the air conditioning. it could just be plain water which is the water condensate from the air conditioner.

look at the engine compartment firewall, find that hose and insert a long stick that can be inserted and you might un clogged the drain line.

if you are loosing coolant from the thing you are saying and you are definite that it is coolant water and not just plain water, then the heater core could have gone bad and leaking and you need to bring it down for repair or replacement.

have you been adding water to your radiator every time you use the car? if not, then im 90 percent it could just be a clogged air conditioning drain.

tnx 4 using fixya,


Posted on Nov 07, 2008

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  • francis rivero Nov 10, 2008

    hi ray,

    glad to hear that you have solve your problem.

    ratings are as important to us as answering your questions, and if i was able to pin point your problem, would you mind if i ask for a Fixya rating. it would boost my rating and my eagerness as well to answer more problems like yours.

    thank you in advance,


  • h_bond Sep 23, 2011

    I have similar problem on my 96 h1 but I have 2 keep adding water 2 radiator. What could that b besides possible heater core problems?

  • francis rivero Sep 23, 2011

    Hello H_Bond,

    If you are adding water to the radiator, then it could be a heater core.

    To diagnose it, run the engine with out an A/C, then observe if there would be water coming out of the drain of the A/C or even inside the vehicle and if you do, then you have a bad heater core.

    But if you do not find any water leaking inside or on the A/C drain pipe, then it could be coming out some where else and you need to find it. Check also the radiator cap. Sometimes, water is just leaking out on the cap if the seal is no longer good.


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