I have 06 GC 4.7L 4WD with about 76k miles and original issues are exhaust manifold bolts broke off and water pump gasket leak. I replaced the exhaust manifold gasket and broken bolts and the water pump gasket and installed new antifreeze from Mopar. Now the issue is the car overheats as soon as I installed the rad cap and starts driving. Below is what I did so far. Any help would be greatly appreciated.
Replaced and performed the following.
-Thermostat and radiator cap.
-Purge all the air and ran heater to max while purging the air.
-Disconnected upper and lower rad hoses and ran water for few minutes and I have a good water flow on the lower and good water flow if I block the lower port.
-The antifreeze will start coming out of the radiator fill port if I rev the engine with the rad cap off so I think the water pump is OK.
-The car WILL NOT overheat as long the rad cap is off and not driving.
What I noticed when filling up the radiator with antifreeze it takes a while before I see the fluid on the upper hose thru the purge outlet. I have feeling that I have head gasket leak or I hope just blockage somewhere in the radiator. Any idea?