Maxima SE V6-3.5L (VQ35) (2002)
Blower Motor: Description and Operation
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Automatic Air Conditioning System *
SYSTEM DESCRIPTION
Component parts
Fan speed control system components are:
1. Auto amp.
2. Fan control amp.
3. A/C LAN system (PBR built-in air mix door motor and mode door motor)
4. In-vehicle sensor
5. Ambient sensor
6. Sunload sensor
7. Intake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the automatic amplifier based on inputs from the PBR, in-vehicle sensor, sunload sensor,
intake sensor and ambient sensor. The blower motor applied voltage ranges from approximately 5 volts (lowest speed) to 12 volts (highest speed).
The control blower speed (in the range of 5 to 12 V), the automatic amplifier supplies a gate voltage to the fan control amplifier. Based on this voltage,
the fan control amplifier controls the voltage supplied to the blower motor.
Starting Fan Speed Control
Fan Speed Control Specification / Auto A/C
Start Up From "COLD SOAK" Condition (Automatic mode)
In a cold start up condition where the engine coolant temperature is below 50 °C (122 °F), the blower will not operate for a short period of time (up to
150 seconds). The exact start delay time varies depending on the ambient and engine coolant temperature. In the most extreme case (very low ambient)