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This is a 2002 Subaru Impreza WRX.

I just bought it from some lady and it's overheating badly. I took it to a mechanic and changed the radiator, got a radiator flush with the water hose, put in a new thermostat, they told me my head gasket was good that I didn't need to change it, and I also put in a new coolant temperature sensor.

If anybody knows what the problem could be please let me know because it's still overheating.

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  • Have you checked the cooling fan is working? and it operates at the correct temperature?
    – Solar Mike
    Mar 5, 2018 at 7:48
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    Is it actually losing coolant can you see? If it's not leaking then in addition to MadMarky's suggestions I'd also consider changing the radiator cap - these can be problematic on this model and are a cheap and easy part to change as well.
    – motosubatsu
    Mar 5, 2018 at 10:53
  • Could you check the water pressure someway and see if it’s upto spec (if there is a spec for it)
    – sjfklsdafjks
    Mar 5, 2018 at 14:42
  • Did the mechanic pressure test the system? Also you can test the cap as well. You could just be losing pressure and therefore losing circulation.
    – finleyarcher
    Mar 5, 2018 at 17:18

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The cooling fan and water pump are usual suspects that you did not mention yet. A bad water pump will overheat an engine really quickly because there is insufficient coolant flow, a broken cooling fan usually only becomes a problem when a car is stationary or in slow traffic.

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  • Don't just check the water pump, have it replaced along with the timing kit all at the same time. You don't want to solve a cooling problem and immediately loose an entire engine to timing failure. @motosubatsu also has a good point about the rad caps.
    – Sam Basso
    Mar 5, 2018 at 14:13

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