2. | Connect battery power to the No. 1 terminal of the air mix control motor, and ground the No. 2 terminal; the air mix control motor should run, smoothly, and stop at Max Hot. If it doesn't, reverse the connections; the air mix control motor should run, smoothly, and stop at Max Cool. If the air mix control motor does not run, remove it, then check the air mix control linkage and door for smooth movement.
- If the linkage and door move smoothly, replace the air mix control motor.
- If the linkage or door sticks or binds, repair them as needed.
- If the air mix control motor runs smoothly, go to 3.
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