my son works in a motor factors in leyland and has been trying to cross reference some radiator fan switches for me to fit the MK rad
so far he has found these both with M22 x1.5 threads
50101 switches on at 84 and off at 79
but it's 3 pin so need to find out how to wire it in
citreon bx 1.9td 83-94
pug 205 1.9gti 87-98

50030 switches on at 95 amd off at 85
2 wire so should be no prob
vw golf mk3 2.0gti 91-97
seat ibiza 1.8gti 93-99
Rescued attachment P9170021.JPG

hot water and a multimeter

You sure the three pin jobbie isn't just for a two speed fan?

IIRC the MK radiator is a modification of a Mk II Escort radiator... therefore I think it would be wise to ask MK before proceeding with guesswork.

Steve