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1996 GMC Suburban 2500 Question: A mysterious coolant leak not directly under the expansion tank. What is it?



bergerbutts, Louisville, OH, August 03, 2011, 13:44

It seems I have a coolant leak(only when the engine is running) which seems to be coming from a water line junction or distribution piece that looks maybe to be plastic. It is under the resevoir tank/ air cleaner inlet, down about a foot or so. It has a hose(maybe 2) coming into it from the radiator and 2 hoses leaving it going into the firewall. It has a device that looks like it might be some sort of vacuum switch with a wire or small hose leading off of it, right beside this junction. Is this associated with the heating system? What would this part be called so that I can order a new one? Apparently, it has a crack in it and leaks when under pressure.

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  • Answer #1

    mastertech6371 August 03, 2011, 13:58

    sounds like a heater control valve. go to autozone and show them. it sounds about right from your description. they can give a bid on the part. easy to change.


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    bergerbutts, August 03, 2011, 14:01

    Thanks Roy

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