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My 88 GT is overheating....I have a Ford Motorsport Alumnum Radiator and stock everything else (cooling). The car has underdrives, that are the only thing that slows the fan down some. I have had no problem for the last 5 years with the car set up like this? Any ideas why? and yes the car does have a full radiator and coolant resavoir.

Try replacing the thermostat first if that does not work try the water pump.

I had a cooling problem could not figure it out,,, It turned out to be a rusty frost plug that leaked...but not enough to make it to the driveway it would drip on to the starter and evaporate. I have had tons of cooling problems, some of them were really sneaky ones...good luck eh...