Hmmm..
These Fans are wired to run continuously with Key On, AC Switch On. This might be a good test to perform before going further.
1) Were the fans working before you pulled the radiator, or you don't know?
2) Were the Ground Wires from the Fans to the vehicle disturbed and/or re-connected?
2) Are you seeing the "check engine" light on the dash message center?
3) Did you have the Thermostat out lately?, was it re-installed right side up?
4) Was the Battery disconnected before your radiator service? A short may have blown a main power fuse. Typically 30A~60A in the Power Distribution Box on your left front fender apron.
You may want to directly power (hot wire) each fan to determine their operating condition as well.
Any one of several connectors disturbed could cause this problem.
