coolant leak help
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  1. #1
    Rods 'n' Sods Junkie stevo1980's Avatar
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    coolant leak help

    Hi, chevy 350 coolant leak on cooling down only from thermostat housing.
    Dont leak whilst running or when hot, just once you have turned engine off and left it for a while.
    I checked Thermostat which was stuck closed, worked it free and tested it in boiling water and started opening and closing ok, refitted and sealed a new housing I had laying around but still leaks...I have a new thermostat coming today but just wondered if could be something else?

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    Off the Xmas card list kapri's Avatar
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    Yup loads !! I've had acouple of mates caars with ongoing problems .One was traced to a warped NEW aftermarket thermostat housing . I've had to buy 4 housing foir my engine to get a straight one as well Also ckeck bolts are correct thread especially if the protrude into water jacket. A metric bolt will tighten into a UNC thread but water will wick up the gap in the thread.

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    Administrator blackpopracing's Avatar
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    What Kev said. My chrome one leaked like yours - it does leak when hot but evaporates off so you cant see it. Sealed it a couple of times and the checked it with a straight edge. Like a banana!!
    Ground it flat on a linisher but it still leaked.
    Bought a new one with the rubber O ring in and no more leaks.

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    Rods 'n' Sods Junkie stevo1980's Avatar
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    ah ok great, I did try and swap the housing with a rubber oring but still leaked, will have try a better quality one I guesse and check the bolts too. Thanks for the advice

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    Administrator blackpopracing's Avatar
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    I changed mine to studs, Glue the studs in with Loctite bearing & stud fix, this seals them & stops them turning. Then just use nyloc nuts to secure. No more manky bolts in the water jacket. Get a straight edge to check your housing is flat, the O ring ought to cure most of it though. A little RTV sealant as well might help if the surfaces are not in good condition.

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