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  1. #1

    Default Need Rear Heater Hose O-Ring replacement...

    I have a '95 Suburban with front & rear A/C and 230k miles. I have antifreeze leaking from the point where the heater hoses connect to the rear heater core. It appears that the o-rings in the ends of the hoses are worn out, but I can't find a replacement (GM only sells the entire hose, and one of the two is no longer available).

    Has anyone replaced the o-rings inside the rear heater hose? If so, where did you buy the o-rings?

    Some background - last summer I replaced the entire A/C system, as well as both front and rear heater cores (so long as I had the interior apart...). In other words, I'm certain I don't have a leaking core. I have also replaced the quick-disconnects for the heater hoses on the intake manifold and water pump. Is it possible to buy another one of those front disconnects and pick out the o-ring and nylon retainer to use inside the rear hose?

    Any and all help greatly appreciated!
    Last edited by KirkW; 01-16-2009 at 09:31 AM.

  2. #2


    Welcome to the site

    2002 Jeep Wrangler Sport 4x4 (the Yellow Jacket)
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  3. #3


    Pull the "O" rings off and take them to an auto parts store and match them up.

  4. #4


    Well, I was trying to avoid disabling the truck while I ran into town to match up o-rings. Alas, that was my only choice.

    For future reference, the rear-heater hoses feature the same quick disconnect design as the front heater hoses that plug into the intake manifold. However, the hose is the female end (with the o-ring) and made of plastic, whereas up front the female end is on the manifold and made of metal. And a smaller diameter.

    Dorman 800-401 is the infamous front disconnect that always corrodes and leaks. But this is not the same size as the rear heater-hose connectors.

    Dorman 800-402 is the same size connector used for the rear heater-hose. In a pinch, one could buy one of these connectors, push out the plastic pieces to retrieve the O-ring, and install that O-ring into the rear heater-hose. But that would be expensive.

    Instead, go to the auto-parts or hardware store and find O-rings that have a 15/16" outside-diameter, with a thickness of 3/32". Buy four so you can replace the O-rings at both ends of the rear heater-hoses.

    Another leak on my truck was the metal crimp-collar that holds the rubber hose to the aforementioned quick-disconnect. Years of road-spray from the rear tire caused the collar to corrode and split open at the weld seam. Removing the collar and replacing it with a pair of 1" OD hose-clamps (four total) solved that leak.

    Ah, the joys of maintaining a vehicle with 230,000 miles....
    Last edited by KirkW; 01-19-2009 at 03:21 PM.

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