The temperature control cable on a 2000 Dodge Durango is located
inside the dashboard, connecting the climate control levers to the heater core and blend door actuators. It's not easily accessible without removing parts of the dashboard. There isn't a single, easily identifiable "cable" like you might expect, but rather a series of linkages and cables that work together.
To access it, you'd likely need to remove the radio, possibly the glove box, and potentially other parts of the dashboard trim. This is a fairly involved process requiring mechanical skills and patience. A repair manual specific to your 2000 Dodge Durango would be extremely helpful.
