there is a vacumm leak .
Either it has a bad ground, or the motor is bad.
its next to the blower motor
The heater blower motor in a 1995 Pontiac Transport is located on the passenger side of the engine compartment. It is on the firewall near the hood hinge.
On a 1995 Ford Ranger : The heater blower motor is in the ENGINE COMPARTMENT , near the firewall , on the passenger side of the engine
The heater motor blower might not work in a 1995 Dakota because the wire harness behind the glove compartment came apart. The radio might not work because of a fuse.
Maybe a bad bearing in fan motor
RIGHT BESIDE THE BLOWER MOTOR UNDER PASSENGER SIDE OF DASH
The heater blower motor itself is located under the hood on the passenger side of the car.
The blower motor speed resistor is burned out.
The heater blower motor will most likely be located under the dash by the heater core assmebly, but first you need to be sure that that's the problem, it could just be wiring to the blower motor. Shouldnt be too hard to replace, and should be simple to find,
under right side of dash near blower motor
fan motor could be bad