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12-18-2001, 11:50 AM
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How to test for exhaust gas in cooling system?
Hi all,
My 1987 300D developed a strange problem suddenly. The cooling system remains under high pressure even when stone cold (left overnight). Yes, I have replaced the radiator cap. The car has never done this in the previous ~4 years I've owned it. The only way I can think of abnormal pressure in the cooling system would be from exhaust gas entering. How do I test if this is happening? The coolant looks clean and smells fine (to me.) There is no oil in the coolant or vice-versa. I suspect either the head gasket or a crack in the head (shudder.) I'm at a loss here... Help! Dave M. Sacramento, CA 1987 300D - 228kmi (weird cooling system problem) 1987 300D - 234kmi 1984 300D - 205kmi 
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