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The system does not use any vacumn lines for dontrols. If the heater and AC does not function as desired, the most likely problem would be the air mix motor. They could be intermittently malfunctioning.
Air max control motor test:
1 . Disconnect the 7P connector from the air mix control motor.
Note: Incorrectly applying power and ground to the air mix control motor will damage it. Follow the instructions carefully.
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, and stop at Max Hot. If it doesn't, reverse the connections; the air mix control motor should run, and stop at Max Cool.
3 . 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.
" 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 step 4.
Fig. 61: Checking Air Mix Control Linkage & Door
Courtesy of AMERICAN HONDA MOTOR CO., INC.
4 . Measure the resistance between the No. 5 and No. 7 terminals. It should be between 4.2 to 7.8 kohm.
5 . Reconnect the air mix control motor 7P connector, then turn the ignition switch ON (II).
6 . Using the backprobe set, measure the voltage between the No. 3 and No. 7 terminals. 6 .
Max Cool-about 1 V
Max Hot- about 4 V
7 . If either the resistance or voltage readings are not as specified, replace the air mix control motor.
To remove the air mix motor, you would have to remove the underdash fuse/relay box.
Monday, December 7th, 2009 AT 6:25 AM