yeah already told me dad about that trick :). The head gaskets tend to be very strong on the Endura engines so I would be unlucky to cook that. I am tempted to just to short the fan for now just to see if it solves the problem in traffic then buy a new switch if it does, I still can't find the damn switch though, only the electrical connector to the fan. That wire is then buried into the wiring loom. Even if it needs a new radiator its not a big job to change them on them cars, I can;t do it myself but it won;t be more than £50 labour from my local backstreet garage.