Wondered if anyone can identify this problem, before I take it to the
dealer.

I have a A4 B6 1.8T Q and for some reason the blower will not work when the
temp is below 8c, as soon as the temp goes above 8c it works fine lol.

This is a well strange problem, the heat blows out fine under its own steam
on the motorway when its like -2c but the fans will not come on, the water
temp is perfect at 90c and the header tank is at the correct level.

The interior climate control shows full speed on the fan blower but they do
not come on, is there some sort of sensor within the car that senses a temp
somewhere and tells the blowers to come on/off

Another weird thing, in the summer or at any temp where the blowers work,
when you put the wipers on, the blower speeds up for a few secs and then
goes back to normal, it's as if the sensor on the dash gets momentarily
confused by the wiper sweep and speeds up the fans.

Anyone any ideas before it goes into the dealers?

Cheers