Chart 3 Improper Air Delivery

CIRCUIT DESCRIPTION

The heater and A/C programmer will direct the blended air in one of several air delivery modes. While the side window outlets receive airflow during all modes of operation, the air is directed to the other outlets by the heater and A/C programmer energizing specific vacuum valves feeding the appropriate combination of mode valve actuators. The heater and A/C programmer determines the proper air delivery mode based upon the current program number, control panel setting, set temperature, low side temperature, coolant temperature, ambient air temperature and sun load.

TEST DESCRIPTION

Numbers below refer to circled numbers on the diagnostic chart.

1. Checks the air inlet valve (door).
2. Checks the DOWN part of the UP-DOWN valve (door).
3. Checks the UP part of the UP-DOWN valve (door).
4. Checks the A/C side of the A/C-defrost valve (door).
5. Checks the defrost side of the A/C-defrost valve (door).