Work you way from the blower motor first by checking that it has both power and ground and then check the rest of the electrical system............
should be the connector in the ac housing closest to the blower motor
99 Durango doesn't have a Heater Control Valve, It only has a thermostat
A Dodge Durango does not have a water control valve in the heater plumbing. The cabin temperature is controlled with airflow control doors.
How to replace the inside Spectra Heater Core on a 2000 dodge durango??
No such part exists
You need to replace blower motor resistor.
The resistor is under the passenger dash just left of the blower motor
With great difficulty!
It is under the dash, behind the glove box.
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.
If you are asking about the blower you only have one that controls both the heater and the a/c............
The blower motor speed resistor is burned out.