coolant problem sti import v4

Discussion in 'General Motoring' started by Subaru Sti v4, Jul 19, 2003.

  1. well my mech fitted the new thermostat and I got a new header tank!.
    but I went for a drive a few days later after I checked the coolant level,
    and it was still pushing the new coolant out of the expansion tank the one
    near the battery!.
    the coolant goes down in the header tank to the expansion tank but does Not
    go back to the engine or header tank! what is going on??.. .

    should I put a old thermostat in with the stat part open so coolant flows
    around the engine ect.. . and block the expansion tank over flow pipe on the
    top off??.. .

    is it a good idea to to do this??? .. .

    help please......... .
    Subaru Sti v4, Jul 19, 2003
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  2. Hi,

    Any chance there's some foreign material in the overflow tank that is
    acting like a one way valve, stopping the reverse flow into the radiator
    when things cool?

    I've seen leaves, bits of paper or plastic and all kinds of other crud
    (including a dead mouse!) in overflow tanks over the years. You might
    want to remove the tank, rinse and drain it, and remove the little hose
    and make sure it's not blocked, too.


    Rick Courtright, Jul 21, 2003
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  3. Subaru Sti v4

    Viktor Guest

    I had a similar problem with my Forester, and new hose clamp fixed the
    problem. What happens is that when the coolant expands it flows into
    overflow bottle, and when it cools down it suppose to go back into the
    radiator. But if you have a tiny air leak somewhere, air will get sucked
    back in since it's much lighter then coolant, and coolant will remain in the
    overflow tank. There are several things to check: radiator cap (doesn't
    seal properly), hose clamps, and could be something related your thermostat
    replacement where something wasn't sealed properly (that's what I would
    check first if you didn't have the problem prior)....
    Good luck!
    Viktor, Jul 22, 2003
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