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Click on the link to see the complete article with images check it out here: Nissan 240sx S13 Heater System: blower motor, heater valve, ventilations and more. Garage411.com


HEATER
The heater assembly is contained in a housing beneath instrument panel or gauge cluster. Heater assembly consists of blower motor, heater housing and core, heater valve, and control panel.

VENTILATION
Ventilation is a separate function from heating and is combined with the heating unit to obtain fresh air ventilation when required. Separate selector lever, push button or position setting on mode lever permits fresh air to enter passenger compartment. Blower switch position determines airflow volume.

OPERATION - MODE SELECTION

Mode lever or push button controls airflow doors (intake, blend-air, heat, defrost and ventilation). Lever setting on control panel determines door positions.

Fresh/Recirculated Air Door
With door in the open position, outside air flows into heater system after passing through blower motor fan. With door in closed position, inside air is recirculated through heater system.

Ventilation Door
Ventilation door (fresh vent door on some models) permits fresh air to flow from dash panel registers.

Defrost Door
Controls air delivery or defroster outlets when this mode is selected. This separate door opens when mode door closes off floor and dash panel outlets to direct air to windshield.


TEMPERATURE LEVER

This lever setting positions blend-air door to direct flow of air through heater core (hot setting), around heater core (cold setting) or mixture of both. The lever also controls opening and closing of heater valve. At any setting except cold, heater valve is open, allowing engine coolant into heater.

BLOWER SWITCH

Switch controls speed of blower motor through resistor assembly. Either a dial knob or control lever may be used to select blower speeds.


ADJUSTMENTS

INTAKE DOOR
1. Before installing intake door motor, ensure wiring harness connector of intake door motor is connected. Turn ignition on. Turn (depress) recirculation button on.
2. Install intake door motor and lever (if removed).

Set intake door rod in recirculated air position and fasten door rod to holder on intake door lever. Ensure intake door operates properly when recirculation button is pressed on and off.

MODE DOOR
1. Rotate side link by hand and hold mode door in vent position.
Install mode door motor, and connect wiring harness connector. Turn ignition on. Turn (depress) vent switch on.
2. Install rod of mode door motor to side link rod holder. Turn (depress) defrost switch on. Ensure side link operates at fully open position. Also turn (depress) vent switch on to ensure side link operates at fully open position.



Click on the link to see the complete article with images check it out here: Nissan 240sx S13 Heater System: blower motor, heater valve, ventilations and more. Garage411.com

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