Moin had written it earlier in another topic, But there it goes below ! Maybe it is of interest for some here . The temperatures are going up again , There must be another logic with the treasure ice ! meanwhile I doubt the temperature display in the instrument strongly . there are deviations of 10 degrees normal . also the display in the MSTG read out is not exactly the climax , especially if the cooling water temperature sensor is as old as the vehicle ! This sensor’s probe pin sets off a `defeat’ , which influences the evaluation of the temperature . partly the old 2 pole SEnsor for the MSTG only reacts after delay and that can be up to 25 seconds (finger sample ) . moreover these sensors become very sluggish and the display in the instrument, reacts even with delay , up to 20 seconds ( According to decade ) . the lot of water must be refilled by leaks , which also gets a lot of oxygen into the cooling water r and damt `Blüht` der Kühlwasserkreis auf ! I had once made a resistance decade to the sensor grip of the 1-pole sensor for the display in the instrument to see how `exactly` the treasure ice in the instrument is, terrifying ! actually this could every here time itself try , which has a decade ( about 6 Euro ) and a good access to this sensor . e.g.http://www.pollin.de/…/resistance decade_5_1_M_.html with the decade you can also test other things e.g. tank display . man k ann of course also with the upper thermoswitch on the cooler , (because of the better access ) its large fan a little hairdress ! for cooperation is asked ! mfg