Chain auto parts stores rent cooling system pressure tester. I know of know better way to know for sure where all leaks are coming from, with the exception of a head gasket.

Very simple to use. Perform test on a cool engine.

I went thru a frustrating coolant loss problem on a 126 car and would never have found it were it not for this device.

My 2 cents.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"