Well curious update. Did another combustion gas test. Constant streams of bubbles without me even using the bulb. Nice, BLUE bubbles. Never could get the fluid to turn yellow/green which indicates exhaust gases in coolant. continues to get hot then cool. ZERO steam outta tail. I am convinced it is a head gasket but please give me a proper sign. there's no other way for air to enter the coolant system? Well, time to get my hands greasy.