[vettestr]

Hey Ernie,
Hope all is great for ya, is this on newest toy?
I am being beat by an air problem that I can not figure out. The car needs to have air bleed from coolant system if parked for very long ( a week ). Never looses any coolant or spill on floor but will be low in engine if checked cold. The expansion tank is level or maybe a rch lower than engine due to space problem.
I think when parked with hot coolant that is pressurized and expanded and allowed to cool it is creating a drop in pressure (vaccum almost). The engine is sealed and all is expanded, then it cools and goes from + pressure to a cool - pressue . When it transitions to the cool (no pressue ) mode it is pulling air by the lip seal on the waterpump ???? Lip seals only work well in 1 direction and if a lower pressure is on the wrong side of lip seal could it pull air into system ??? I have verified it is not combustion gasses in system so where and why.. Im beat