Air Recirculation Malfunction

Air Recirculation Malfunction

Diagnostic Aid

* If the control A circuit of the recirculation actuator is shorted to ground, the following conditions will occur.

- The recirculation actuator will operate properly when recirculation is requested.

- The recirculation actuator will continually modulate between the outside air and recirculation positions when outside air is requested.

* If the control B circuit of the recirculation actuator is shorted to ground, the following conditions will occur.

- The recirculation actuator will operate properly when outside air is requested.

- The recirculation actuator will continually modulate between the outside air and recirculation positions when recirculation is requested.

* The condition may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.

* Inspect the recirculation door and the recirculation actuator for the following conditions:

- A misaligned recirculation actuator.

Refer to Air Inlet Valve Actuator Replacement Air Inlet Valve Actuator Replacement.

- Broken or binding linkages.

- A broken or binding recirculation door.

- An obstruction that prevents the recirculation door from operating within its full range of motion.

- Missing seals to the recirculation door.

- Misaligned seals to the recirculation door.