I'd agree with Jon, the new one isn't much good at the best of times but in the recent colder weather it's poor to say the least. It takes considerably longer to warm up than other cars I've had.
In the mornings I have an 11 mile commute to work. If I leave the climate on say about 23 degrees the temperature needle does not climb to the normal running position until about 10 miles into the journey and there isn't much heat until a good 4-5 miles into the journey. If the climate is switched off the normal running temperature is reached about 7 miles into the journey, which is fine when the weather is milder because effectively the heater is off but recently it's been too cold to have the heater switched off. But what I've noticed is if you have the heater switched off and the normal running temperature is reached as indicated by the temperature needle, if you then switch the climate/heater on the needle drops before climbing back up again. This is only when the engine is, like I say, warming up and not when fuuly warmed up.
Hope this helps.
Shaf
Nov 2002 TDi Sport, Silver,Black/grey interior,climate. Replaced previous Mar 2001 TDi SE