Join Date: Jan 2008
Location: Tunbridge Wells
I had moisture then ice during the very cold spell on the inside of my windscreen. Others have suggested leaks - if none are present, I would check your pollen filter has been changed. This is frequently missed during servicing and my GT hadn't had it done from new over six years ago. This gets completely blocked with debris and stops fresh air flowing through the car and hence any dampness in the car stays in - any on your windscreen freezes.
In the GT, the pollen filter is located under the passenger-side dashboard - I have posted before on this subject so try doing a search to find my original post. It is a relatively straightforward DIY job but a bit fiddly to locate and undo the screws to the pollen filter housing. You also have to have your head under the dash with your legs sticking out of the car. A contortionist would be amazed!
Alfa Romeo GT Cloverleaf Q2 170bhp
Alfa Romeo 159 Sportwagon TI Q4 210bhp