don't cut a hole in the radiator. the side tanks are plastic and super fragile. there's no material to cut threads into.
no personal experience with efan's but a temp sensor in the radiator return hose seems like a good idea. that way the fan only runs when the cooled coolant exceeds something like 140.
01 1500 Reg Cab 4wd 5.2 auto 3.55 285/75/16 steps tow hooks sc3815 180 3923 trans cooler filter posilok powertrax (removed) timbren britebox pioneer head rockford amp speaker cobra cb firestick hughes plenum water pump timing chain oil pump rear main hub bearings brakes shocks cracked dash cad bushings seals ujoints trackbar tcase Robert Griffin Trans