How do you get AIR in a sealed pressure system?
1. Head gasket COULD allow pressure to seep in (air)?
No other way I can find out.
Pressure test NO LOSS after 45 min at 18 psi
Engine leak down almost looked like a new engine (210,000 miles oil changed every 5,000 miles Have records)
I got the waterfall GONE then 2 days later BACK makes zero sense to me.
Any idea before I open a bottle of Glenfidich and float it away?
This is still the 2000, 2003 is spot one.

 

Maybe the cap itself. Looks like the only thing not tested with the system tester.

 

There's also the possibility of a slipped liner, but not without that loud ticking sound.

 

You dont need a slipped liner, a simple crack in any of the headbolt holes will allow gas or coolant to migrate.i think your getting ahead of your self, ch or replace your cap. Is the system pressurized? Top hose hard as a rock? Is it pressurized hours after driving.

 

Quit as a mouse even with a stethoscope