OK folks,

        Be gentle here as  coolant questions way to often end up with very scary responses.

I’ve noticed that even a few days after a bus trip the van has air in the expansion tank.  usually the tank is about 3 fourths full.  If I turn the blue cap I hear bubbles and sound of pressure.  today a sighted friend told me that when I did this the expansion tank filled up with coolant.  Interestingly the level of the over flow tank never seams to change.

The van was recently checked out at a VW shop and he was suspicious that a tiny seep of coolant might be coming from one head but it was so slight he could not be sure.

So, my van seems to build up pressure when running and holds it for several days.  Once released the expansion tank fills but level of overflow seems consistent.

Is this normal or a sign of something needing attention.

temp indicator is consistently just below the led.

Eric Caron 
85 GL Auto Westfalia