Hello.

I have problems with heating system on my Audi A3 - I have changed radiator so now it heats, but the problem is that it blows incorrectly - if I press to blow on front window, it blows everywhere but not on front window and also it happens with other programs - it blows where it wants to blow. And also if the ride is longer in the beggining it blows warm(hot) air and after some moment it starts to blow cold air.

Is the problem with blower motor or is there something else?

It is not the blower motor, it is the controls for the air ducts. Unfortunately I know nothing about how it works.