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Old 04-06-1999, 11:36 PM
chris
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I went to add a little coolant to a cold engine. When I went to remove the cap it released pressure and the coolant level rose like it was hot. Is this normal? I have had a problem with the coolant leaking out of the overflow tube.

Thanks,

Chris P.
  #2  
Old 04-07-1999, 10:31 PM
M.B.DOC
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Unless there is a problem with the radiator cap you shouldn't have much pressure build-up. Possibly there is blow-by from the head gasket getting into the cooling system! Have it checked out soon!
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Old 04-07-1999, 10:49 PM
Benzmac
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The cap has two functions. It holds pressure in to raise the boiling point of the coolant but it also has a check valve built into it to allow for contraction when cooling. If this check valve fails you may hear a sucking sound when you remove the cap. That sound is actually vacuum not pressure. I would replace the cap before going any further.

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