HVAC fan? Engine cooling fan?

To remove the fan clutch in an 04 Ram 1500, hold the fan in place using a special fan removal tool. Turn the nut to remove the fan. The tool should be able to be rented through a local auto parts.

It sounds like your fan also has a light with it. If your wall switch is a two gang box with two switches in it most likely one switch is for the light on only and the other switch is for the fan on only. This can be checked out by installing the fan and making the connection green to green, white to white, black to black. Turn on one of the switches and see if the fan operates. Disconnect this connection and then connect the red wire to the black fan wire. Turn the other switch on. If the fan turns on again, then the two switches were installed to operate the fan and light separately. If this is the case disconnect the red and fan black wires and reconnect the black to black. This is the fan connection. Connect the red to blue fan wire and this is the light on the fan connection.

Fan mail not known at this time.

Alluvial Fan