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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 04-24-2009, 01:01 PM   #1 (permalink)
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Coolant loss when engine turned off

Hi,
does anyone know what is happening? Temperature guage is normal, but as soon as I switch off the engine after running for an hour or so, then coolant leaks from the pressure valve (several pints). I assume that as soon as I switch off the engine then the engine heat is boiling the water but what is occuring that doesn't under normal operation? I have no idea .....
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Old 04-24-2009, 07:00 PM   #2 (permalink)
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yeah, I know what's going on...you have too much water and not enough antifreeze in your system. The steam from boiling water seeps after shutdown...antifreeze is also antiboil.....I'd change the coolant altogether after tightening all of the hose clamps and see what happens...good luck
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Old 04-27-2009, 02:29 AM   #3 (permalink)
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Many thanks

Thanks .... will try over next few days. A lot cheaper than I was expecting!
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Old 04-27-2009, 02:32 AM   #4 (permalink)
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You may also find a new radiator /expansion tank cap may be a good idea too.
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