OK ... I replaced the heater valve ... not the problem ....got the left dash lowered (knee board removed) saw the source of the leak!

It is the left silver pipe coming out of the left side of the heater core. Easily dribbling away. OK so far so good. It has two bolts that holds on a collar which keeps the pipe secured to the heater core unit.

The question: Is there a gasket in there? That is between the silver pipe and the heater core unit?

Additionally, when tightening it, how tight?

Thanks .... the guts of the dash are on the floor awaiting someone's expert reply.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)