If you are asking about the blower you only have one that controls both the heater and the a/c............
For the 1989 Dodge Ram, the heater blower motor resistor can be found on the passenger's side, on the bottom of the heater box. It is beside the blower motor.
Because it is an Dodge. GET A CHEVY
should be the connector in the ac housing closest to the blower motor
It is under the dash on the passenger side.
fuse location 7
On the Dodge Ram truck, the heater fuse for the blower is on the fuse panel on top of the battery. There is also a blower motor resistor on the blower motor. The fuse to control the heat control panel is in the fuse box in the dash.
There is a fuse under the hood for the blower motor.
Most likely a failed blower resistor.
It should be in the heater blower motor case which is located under the glovebox.
under the glove compartment I was told!
Bad bearing in blower motor?