My rear heater seems to be leaking that nice sweet smelling coolant but only
when its running.

How do you determine if it should be repaired or replaced ??

I've seen several messages go by over the years that deal with a set of "O"
rings at the core.

I'd like to have a rear heater that operates properly so I won't do the by
pass thing.

Any suggestions as to what to look for or any other tips would be
appreciated.

Barry

Sudbury, Ontario
Moo  88 westy @ 163k Km

99 A4 Tdi  Jetta  - the Jet @ 40k km.

Thanks all!