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Old 07-23-2001, 11:16 AM
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Mike Murrell Mike Murrell is offline
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Join Date: Feb 2000
Posts: 2,359
I went through a similar situation recently with a 103 cooling system.

It turned out to be a leaking overflow tank. It's pressurized and because it was not holding pressure, it was leaking as it would if the cap were weak. It's also possible that your cap is bad in spite of it's recent replacement, or you "might" have air in the system. These are but a few of the possibilities.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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