i've just ran in to an overheating problem too,

she boiled over at weekend after i'd been out for a run in her, bled the system and ran it up so no air pockets but had no fans come on,
so ordered a 82 degree thermo and rad fan switch and fitted them, ran it up again and still no fans!

have wired the fans up direct from the batttery and they work fine so I by-passed the rad fan switch with the aid of a split pin but still no fans!
the relay is clicking and have changed it for another ford one which does the same and have also checked the fuse and this is ok.

so has it got to be the wiring from the relay back to the fans or is there something else i could try??

many thanks
Dave