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sounds like a fan or fan clutch issue. i dont know if you have an electric or manual (engine driven) fan because you didnt provide year, model of alfa, or engine. could also be a partially clogged radiator
Ok........before replacing the thermostat, I would have run the car for 15-20 minutes, then turned the engine offf.......then feel the top and bottom radiator hoses.....if they are the same, and the fan did not come on, then this would be the fault........however, if the top was boiling hot and the bottom was cold this would indicate a faulty thermostat...........
Next step, as the thermostat is new.......run this test again and if the hoses are different temperatures, then this might indicate a blocked radiator......BUT more info required....is the temperature gauge going past half way ?????
good chance you t-stat is stuck open that will cause the temp gauge to not get all the way to normal operating temp. also e.c.t can cause this problem. good luck hope that helps. to bridge your connector it will not really tell you to much if you take a multi meter and check the green wire and put the other wire to ground you can see the signal voltage less then 6v
no but there are a couple of cooling fan switches that could be causing your problem both are mounted on the motor one near the thermostat housing the other will be in the block one near the thermostat usually controls the fans.