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Old 08-30-2001, 12:24 PM
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Mike Murrell Mike Murrell is offline
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Join Date: Feb 2000
Posts: 2,357
It could very well be a tired pressure cap or the expansion tank itself is losing pressure. If you see no leakage on/around the expansion tank, try a new pressure cap. On other non-MB cars, I've also experienced this problem if there was air in the system; that sort of thing generally occurs right after a coolant flush/refill.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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