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This is a 2.0 petrol engine. Already had the t'stat replaced twice. When the car is stationary in the P gear, the coolant temperature gauge will slowly reach 40-45% of the scale and stays like that. Radiator fans do not kick in. As soon as the car is on the move with reasonable speed, the gauge drops to the very bottom of the scale. See the photo, this is after 20 minutes of driving on the motorway. The cabin blower gives then at most warm air (not exceeding 30 deg C/86 deg F), which proves that the coolant's temperature is too low (so it is not a false reading of the temperature sensor, I think).

I am really out of options, any ideas what might be wrong?gauge after 20 minutes of driving

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