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Hi guys Car in question is a GF8 with an ej20g engine. Recently I disconnected my coolant fill tank when I removed my intake manifold for painting and I've had an overheating issue since. I've bled the system alot and I think I've got the majority of the air out of it. I am using straight water though but that'll be remedied when I do flush the system. Today (second day of bleeding) everything looked stable no air coming out of the coolant, so I fitted my rad cap and took her for a test drive with the temp gauge in usual spot. Not long after that, it overheated. Ive shut my engine off and given it a rest for five min and it has gone right back down to midway. It quickly rose though. The temp gauge does fluctuate, so does the tachometer intermittently, mainly when I was off throttle rolling downhill. That suggests to me I've reconnected something incorrectly. I am pretty confident I've reconnected coolant hoses from the tank properly - the one at rear leads to the metal bit on top of the engine beneath the manifold, not to the block directly. I don't see any oil in coolant or coolant in oil. It could be an issue with my heater, as my a/c does not work due to a short. However my car was not overheating before when the heater was not working. Coolant does gush out once cap is removed Hot and steam. I'm at a loss as to what it could be. I'm guessing it's my half arse intake manifold job. I really hope I haven't hooked up an oil hose to where a coolant hose has supposed to go.
