Hi,

The A/C radiator fan on a '93 TR exec 4 cyl doesn't seem to kick in no matter how hot it gets :( Can't see any obvious wiring problems and there doesn't appear to be a fuse for it, any ideas what I should be looking for?

If your A/C works does the fan turn on with the A/C? If not look at the fan relay. (swap with the horn relay to test the circuit)
If the fan does work with the A/C but won't cut in when the car gets hot a/c off, then look at the temp switch in the bottom of the radiator (bridge connector to test)

Cheers, will check that out later :)

Hmm, it turns out that the fan motor is burnt out. The genuine replacement part from Mitsu is $224 :cry:

Try a wreakers. Can't be that much for a new fan motor and it'd be easy to test it.