I had this on my tipo many years ago and it was caused by a siezed heater control valve,it's mounted on the side of the heater matrix and is accessed by removing the passenger side glove box.
Pull it apart carefully.The heater is clearly knackered - the dial only turns one notch and won't go further, so the heat for the windscreen and cabin is basically non existent. Trouble is, I don't fancy pulling the unit apart to find out what's going on. Advice needed!
...I'm also looking to spruce up the exterior bits - does anyone know a decent supplier for Tipo badges? Mine are faded to beige... I'm after proper blue ones or a potential way of restoring these!
Ta, as always!
Camo