2000 Sonata V6 Radiator Fan (checking operation)

I just recently changed the radiator fan on my GLS. I replaced the hoses, coolant and themostat at the same time. The fan has yet to come on even after the car warms up and even when I was refilling the radiator after the repair. The temp gauge doesn?t get hot. How do I check to make sure the fan works? When I turn on the A/C only the condensor fan comes on. I thought that I might have a bad coolant sensor or maybe its just not hot enough outside for it to come on. I live in Atlanta, GA.