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Disconnect the 7P connector from the air mix control motor.
Incorrectly applying power and ground to the air mix control motor will damage it. Follow the instructions carefully.
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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, and stop at Max Cool. If it doesn't, reverse the connections; the air mix control motor should run, and stop at Max Hot. When the air mix control motor stops running, disconnect battery power immediately.
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If the air mix control motor did not run in
Step 2
, remove it, then check the air mix control linkage and door for smooth movement.
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Measure the resistance between the No. 5 and No. 7 terminals. It should be between 4.2 to 7.8 kΩ.
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Reconnect the air mix control motor 7P connector, then turn the ignition switch to ON (II).
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Using the backprobe set, measure the voltage between the No. 3 and No. 5 terminals.
Max Cool:
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About 1.0 V
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Max Hot:
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About 4.0 V
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