This may not be the one, but there is 2 sensors on either side of the mustang pony emblem in the grill. They look like 2 squares sort of. I know thats how its on my car now and my 95 v6 mustang. Also since u said radiator, i am guessing its one of them because its right in front of the radiator but again i could be wrong, I know there are 2 sensors there.
1998 Mustang GT automatic stock gears, some mods...sold
Best et firstname.lastname@example.org with a terrible 2.24 60ft
New ride 2000 GTP, gutted air box with K&N, 180 thermo
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*mods after run, Autolite 605s, GMPP STB , MPS 3.7