I have aan '86 van (wasserboxer) that is running hotter than
normal.....with the temp gauge rising more than halfway between the LED and
the upper mark.

The temp drops back to normal when I open the heater valves....and the temp
needle goes back down to the top half of the LED.

Is this an indicator of air in the cooling system.......or do I have a
radiator problem.

This van has been sitting for a long time....and I just got it running
again.

Warren C.