AIRFLOW VOLUME CONTROL OPERATION

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Airflow Volume Automatic Control

1.  The airflow volume during automatic airflow volume control is determined by the target temperature.

•  When the target temperature is in the a-b, c-d range, the upper/lower limit of the blower voltage is calculated and compared with the current upper/lower limit, and the blower voltage is updated only under the following conditions.
•  The current blower voltage is higher than the upper limit: Upper limit becomes the new blower voltage.
•  The current blower voltage is lower than the lower limit: Lower limit becomes the new blower voltage.

2.  The fan speed changes non-step depending on the applied blower motor voltage.

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3.  The AUTO airflow volume calculation results directly after the airflow volume switch is switched on are displayed.

4.  The display of the subsequent auto airflow control calculations, based on the airflow volume output, are updated as shown.

Display

The blower control output range
LO
4.5 V —5.4 V
ML
5.5 V—6.5 V
MH
6.6V—10.9 V
HI
11.0 V or more


Correction

Engine coolant temperature correction (warm-up correction)
•  Controls the blower motor applied voltage according to the increase in engine coolant temperature to prevent discomfort caused by a high volume of cold air blown from the vents in winter after starting the engine. However, the engine coolant temperature correction is not performed the water temperature is 40 °C {104 °F} or less.
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Airflow Volume Manual Control

•  The blower motor applied voltage (airflow volume) can be switched in four steps with the fan switch.

Fan switch

Blower motor applied voltage
1st
5.4 V
2nd
6.5 V
3rd
9.0 V
4th
B+