what do you say about it…? thermostat defective… temperature increased to over 110°c, car driven only 40 km/h, immediately stopped, towed and let change thermostat… earlier temperature between 94 – 96°c at full speed in summer as in winter. today standard 98°c, motor gets quite fast operating temperature, heats the interior bad does not get so much air out. standing overheated the engine again. in the stow I have to step on the gas a few times and the temperature ko mmt again down from 100°c. have had the car tested with a recently eliminated master by opel, no mistake it doesn’t get any further… I also don’t… I love my car, I want it to work perfectly again. have you already experienced something like this…heard???? Water pump is ok! viscofan is ok! in cool water is no oil! composition of the cool water not yet tested. heat exchanger is rough sight tested m.e. free from flying and comparable. thank you for your numerous answers! greeting support