(semi) Random Thoughts:
- Coolant Expansion Tanks, Caps, and Fittings can leak, but not be noticeable when unpressurized.
- Having approx 15psi in the Coolant System is necessary tot e design to operate correctly.
- Heater Core must have coolant flowing through it during bubble purging, air burping, re-filling procedures.
It is , ness, in fact counter-productive to turn on the HVAC FAN during this, you just want the heater's Coolant Valve OPEN.
Note: based on the A2's I campaigned, I always had coolant flowing through the little hose and into the Coolant Exp Bottle, when the Engine was running. This may not be the case w/ A1 chassis 16vs, I wouldn't mind somebody touching on this-
Does a properly working Scirocco 16v have constant coolant flow into and through the Expansion Tank when the Motor is Running?