Operation CHARM: Car repair manuals for everyone.

Temperature Increase/Decrease Knob

TEMPERATURE INCREASE/DECREASE KNOB
With the system in any mode but "OFF" and SET temperature between 18.9°C and 28.9°C (66°F and 84°F), turning the temp knob one detent in either direction, or pressing the warm or cold button, increases or decreases SET temperature one degree. If the knob is turned in the decrease direction or cool button is pressed, to achieve the lowest setting, with the SET temperature at 18.3°C (65°F), SET temperature drops immediately to 15.6°C (60°F) If the knob is turned in the increase direction or the warm button is pressed to achieve the highest setting, with "SET" temperature at 29.4°C (85°F), SET temperature will jump immediately to 32.2°C (90°F)
An increase or decrease of the SET temperature signals the HVAC programmer to take the steps necessary (change blower speed, change air discharge location, change discharge temperature) to bring the passenger compartment temperature to the new SET temperature.
With the system in "OFF" mode, turning the temperature knob in either direction or pressing your warm or cool button, causes the system to turn on in the "AUTO" mode.