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overfilled coolant expansion tank, do Volvos purge? 850 1994

posted by  PatrickB on  Mon Jan 31 03:21 CST 2005
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I recently posted about finding coolant on my garage floor a couple of days after having topped off the fluid (too much; above the MAX line) when it got low. It does not appear to be leaking by the radiator anymore and the level seems to have settled between Min and Max on the expansion tank. The car was out all day yesterday and not a leak or any drop in coolant level. What gives? Do Volvos dump excess coolant for pressure reasons and that is what caused the puddle or did I really screw up by overfilling? I just don't have radiator $$ in the budget right now.

Thanks
1994 Volvo 850 wagon 236,000m








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    The Reservoir cap is designed to 850 1994

    posted by  someone claiming to be cn on  Mon Jan 31 04:00 CST 2005 [RELATED]

    allow excess air or excess fluid to escape if pressure builds up inside.

    You are OK as far as I am concerned.

    You might want to repeat the experiment:

    - Overfill like what you did.
    - Open the hood and Run the car until HOT and see what happens.
    You should coolant escaping through the reservoir cap (which is expected).

    This will explain the whole thing.
    cn







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