> the defective expansion tank cover may have been the main cause of the
> overheating problem the PO had as a result of loss of coolant from the
> system. When I picked up the vehicle he mentioned to me that he was loosing

When the cap blew on the distribution unit and was replace by a ketsup
lid, I switched to a "bad" zero pressure cap that was along as a spare.
The cooling system operated normally for the next 1000 miles of cool
weather driving, suggesting coolant pressure is not critical in a cool
environment.   However, as has been discussed before, it is a critical
monitoring variable and I'm about to install a coolant pressure gauge.

Regards, Tom Neal '87 syncro