2006 Audi A4 Q&A

2006 Audi A4 Question: My audi A4 1.8T (2005) overheats in the mornings when I switch on the heater?

I tried the same thing of switching the heater on in the afternoon and nothing happened. I don't know if it was just a coincidence. -
Answer 1
Must be the gauge circuit or another problem, heater is not actually the trouble. Have coolant level checked. -
Answer 2
poss water pump impellar rotting away,very common -