Good evening to all Phaeton drivers. For about 1 year I also own a diva. After looking for a long time in the forum, I recode several heaters on stand-up heating. Now 2 following problems have emerged. 1.Heating lowers 2.cooling temperature sensor limit value exceeded. So, to 1 is clear, enter code and unlock. But to 2 where is the sensor sitting? I once Googled around and some write, if the value is exceeded, then the circulating pump is defective. If I use the mot or start, then quickly Temper rises. to 60 degrees and it comes in warm air. So I assume that the pump is I.O or am I wrong? In ZAB I can choose when STH should approach and how long. Ask for your help !!! Oh almost forget, it is Bj 2007 3.0 tdi.