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Gti heating

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Mk5il:
Hey
My car has stuck open thermostat that I’ve replaced with new one
After replacement the car is heating beyond 90 degrees on the gauge
I’ve check fan activation and it’s activating and it’s lowering radiator temp, also the radiator temp is lower then block. after the engine reaching 90 degree the thermostat is opening and radiator temp start to raise so the thermostat working properl, but still radiator cooler then block…
What can cause the overheating problem?
I think that maybe there’s problem with circulation of water from radiator back to block. My water pump is steel so I think it less likely that it’s broke the impellers

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