Right side under the dash.
Diagram for location of blower motor resistor can be found herehttp://autorepair.about.com/library/images/bl441a-lib.htm
The heater blower motor is on the interior passenger side. It is kind of a round shaped housing facing the floor.
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.
30 amp fuse in fuse box.
On the inside of the firewall, below and behind the glove box.
It's located behind the glovebox, on the passanger side of the dash
check coolant level
Under the dash, far passenger side.
It's located behind the glovebox, on the passanger side of the dash. How hard is it to get to the fan motor?
The blower motor if failing and pulling to much current.The blower motor if failing and pulling to much current.
Inside the HVAC housing, under the dash on the passenger side.
Check relay, fuses then control head.