The temperature control knob in my 2002 Nissan Sentra stopped working. The knob turned but the air coming out the vent was always hot. Much like the brakes on a bicycle, the knob controls a cable that slides within a shroud and moves a damper for the heater control. But the clip that holds the cable shroud in place broke leaving the cable unable to slide through the shroud. This resulted in the heater being stuck in the “on” position.
Post time: Jun-22-2017