98 Ford Escort Ghia - demister fault

Does anyone know the solution to the failing of both front and rear demisters. This happened about 2 weeks ago, and despite checks by a
mechanic friend, i can find no solution. I have already replaced the 25A blade fuse, with no luck.
Wiring has been checked as much as possible, and this is now getting serious, esp. in this bad weather when you can't see out of your car.
Any ideas???
Iain MacMillan (Mogsy) PC Cheater http://www.pccheater.co.uk / ICQ UIN : 2640717
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