Fire Hose Tester

Thank you in advance - 96 Lincoln Mark VIII 4.6 - Just replaced an actuator IRMC which necessitated the removal of the contribution. Lost about half gallon of coolant in the process. When I turned on the engine after repair, ran at idle for about 20 minutes, temperature gauge right where it should be and the coolant level has not fallen in the tank for me to add. Drew on the test disc, within 2-3 minutes temperature gauge fixed. Quickly became the vehicle at home, let cool for me to pull the plug, then need to add about a gallon of coolant, it has lost some overflow. Now, temperature gauge reads a little hot, but still within the normal range. Checked temp scanner, maintains approximately 215-217. When driving, the temperature will increase as I accelerate, escpecially on the motorway, and backtrack as I cruise or come to stop. Let stand overnight in the vehicle, in the hope of air trapped in the system. This morning, my test model put pressure on the tank, vehicle idling for 20-30 minutes. Built and maintained pressure 9-10 psi. Pressure increase of about 0.5 to 1 psi if I broke back and then full throttle. Temp maintained between 207-212 at idle. temperature gauge reads hot even on the side. I have not had this problem before the repair. You do not see oil in coolant or vice versa. Applied using 15 psi system pressure tester, bled to 14 in just a few minutes. Only leaks visible is the pipe below the t-stat housing, the accumulation of crusty at the end of the pipe housing. Fired motor with reservoir cap, no bubbles, but when I'm outta gas water level rises and falls. Did I blow a gasket within 5 minutes the engine was running hot or something simple I'm missinga

Will gauge 14 is probably just a drop in pressure to the gauge itself. Mark VIII 4.6 liter these cookies are hard. I even saw them perform without headgaskets installed (came from the factory like that - right head on the block). I doubt you blow a gasket. I suppose you have an air pocket. Keep running, crowning, let cool, do it again. Repeat.

Im guessing that you looked behind the t stat and when the coolant has flowed through it fell in the level and the addition of overheating should solve the problem simply run it and keep an eye on the coolant.