Radiator header tank have to be replace better than be rebuilt, radiator itself could be (and should be) rebuilt with new hose and thermostat/calorstat, temp sender unit and thermocontact, like this you start with a new circuit ! Be really careful with the draining back of the car up !
Windows are nightmare to re-do. Mine was like yours, I start to change the electrical part, mean switches, fuse box and motors (by the way booster motor wasn't working with my 308, depending where + is) now it's working well but really hard to adjust with new greasy cable, all I can say is courage. My motor came from Superformance in UK, switches from Trutland (diferent from GTBi and 4v) and fuse box from eurospares (UK), patience from home. It's not hard to take off the door panel, then you can clean it. I have no picture of this work, too much grease on my hands, at least if you don't want to have the new cable grating. For your problem, did you touch the switch wired because wire diagram is complex on the switch due to electrical path from fuse box to driver door then to passenger door, fuse don't blow except if - is gone but diferent assembly is known for 308. Test in case you doubt.
I have completely rebuilt my car so don't hesitate to ask question as long as I remenber it. Sorry for english' mistake.
308 GTB 1979