It does not use a cable. The heater blend door is operated by a electric motor. The complete dash assembly needs to be removed to gain access to the unit.
Heater Airbound? Heater control cable not working? Heater core plugged?
Neither, I believe it's electric.
The most likely reason that the heater control won't change the air flow is that the cable that moves the diverter valve has broken and will need to be replaced.
Remove the radio/heater control module. Disconnect the temperature control cable at the base of the control assembly . It is on the center mound just to the right of the gas pedal. Take the heater control cable off of the back of the heater control module. Pull the temperature control cable off.
The 1997 Chevy Blazer shifter cable will have swivel nuts on each end of the cable. Connect the shifter cable and turn the swivel nuts to the right to install the shifter cable.
I believe that the first digital cluster on a S-10 Blazer was in 1989.
cable
disconnect your neg batt cable
Broken cable?
The 1996 Chevrolet Blazer shifting cable will have a retaining nut on each end of the cable. Loosen the retaining nuts. Remove the cable routing retainers. Reverse the process to install the new cable.
If you are refering to the Hot/Cold knob on the inside of the car on the AC/Heater,,,,yes,,, that is the only knob operated by a cable the rest of them are either vacuum or electric
About 30 min.