on an old rst of mine i fitted a airtec rad and fmic and had hot running issues and tryed all sorts too cool it

i found with the alloy rads i can only get the car too a safe level after buying the msd uprated fan switch they used too sell along with the 82 degree thermostat, i tried all manor of things including genuine ford switchs/sensors ect and made no difference untill i got the msd bits, they for some reason only worked well with the alloy rad, as i fitted them too a car with stock rad and it seemed the same???

what thermostat and what fan switch do you have fitted?
and where are the fans mounted? i think they work better mounted too the rad and not the cooler (from personal experience)