Hello to all, yesterday during my stroll with my a6 2003 4.2, the high temperature light switched on (I have to specify that I tried to run the air-conditioned air but the air was hot all the time,so after 5 minute , the High-temperature light lights(switches on) and the temperature of the engine reached the maximum help I, it is the thermostat where simply a valve at the level of the climate control which is defective thank you