My rear heater was dripping a very small amount of coolant (approx 1 drop
every 5 minutes). It was enough for me to be concerned as I could smell the
coolant while driving. I pulled it apart and inspected everything. The core
is fine and doesn't appear to be leaking. However, it seems as if it is
coming from the flat rubber o-ring on the on/off switch part (don't know
what it is called).  I pulled it apart and put rubber gasket seal over the
two pieces. I can't see any aparent leaks but I occasionally smell coolant
when the heater is running. Should I just replace the o-ring and try all
over again??

Chad 85GL