'94 Aerostar, 140,000 miles :
Cold start in the morning. Warm up seems normal. Heater function
warms up along with the temp gauge. Once warmed up the needle sits
the "N" and "O". Here's where it gets strange. After a minute of
two the needle starts
to creep up to the "L". Heater is normal all this time. About the
time I think I'd better pull
over the needle goes back down to the "N", pretty quickly.
I drove around for a few minutes with the cap on loosely to get the
air out of the coolant,
and the level is good. Is this a sign of air in the system ? If so
how do I get it out ?
Once it's gone through this warm up scenario the van runs great.