2000 jimmy heater problem

[dmoney002611]

just replaced heater core in 2000 jimmy. heater does not work still. coolant is flowing through the core. on the passenger side near the kick panel there is a wire plug with 3 wires (black, brown, blue)- which are the same color (and number of) wires as on the rear of the a/c temperature controller. i think this is my problem. does anyone know where this plug plugs into? i have looked and can't see.