Asked by Joshua Jul 15, 2019 at 05:45 PM about the 2006 Subaru Impreza WRX STI Turbo AWD

Question type: Maintenance & Repair

So I replaced my radiator, coolant overflow tank, and
thermostat and bled the system and my car still
overheats. It had about 110k miles on the motor. At
first my overflow tank would bubble and go
everywhere. I bought some blue devil headgasket
sealer and put it in and my car still was overheating
and I'm about to add coolant because it looks pretty
low but idk what it could be. I saw some white smoke
coming out of the overflow tank but it smelled like
coolant so I shut the motor off. Any ideas? From what
I've been told it's a headgasket leak but it doesnt
seem bad like the car runs and sounds good but it
just overheats.

1 Answer


The bubbling overflow is almost a giveaway. Says, air in the system. A few things to check: 1) Are you certain you have a 50/50 mix of coolant and water? Too much water will make it overheat. 2) Remove the spark plugs and check the color. They all should be the same color. If not, note which cylinder is off. 2) Get a pressure gauge and check the compression in each of the cylinders. All should be within a few pounds of each other. I expect you would have 140 to 160 psi. If one or more is low, you have a leak somewhere. Could be valves, piston rings, but most likely head gasket. Post your results.

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