Air Delivery

AIR DELIVERY DESCRIPTION AND OPERATION

AFTERBLOW
Afterblow is a feature that dries the evaporator core by operating the blower motor after the engine is turned off. This reduces the amount of microbial growth that can create undesirable odors. The vehicle does not come equipped with the afterblow feature turned on. If the afterblow feature is required due to an odor concern, it must be turned on by the scan tool.

The following conditions must be met for afterblow to operate:
- The A/C compressor operated for more than 10 seconds.
- The A/C compressor, after operating for more than 10 seconds has not been deactivated for more than 10 minutes.
- The system voltage is at least 11 volts to start and 10 volts to continue to run.
- The ignition has been in the OFF position for at least 20 minutes.

Once the above conditions have been met the following sequence of events will occur:
- The blower will run for 4 minutes at 59 percent blower speed.
- The recirculation door moves to outside air position.
- The mode valve moves to the floor position.

AIR DISTRIBUTION
The HVAC control module controls the mode actuator in order to distribute airflow to a desired outlet. The mode switch provides the vehicle operator with the ability to override the automatic setting. When the mode switch is moved to the bi-level through defrost positions, the A/C compressor clutch engages and the recirculation actuator will be moved to the outside air position. When VENT is pressed the following will occur:
- The mode valve will be moved to the panel position.
- The recirculation actuator will follow user request if blower is on and power mode is in run.
- The A/C compressor will follow user request if blower is on and power mode is in run.

RECIRCULATION OPERATION
The HVAC control module controls the air intake through the recirculation actuator. Recirculation is not available when the mode is in bi-level through defrost. The operator must activate the blower for Recirculation operation.