Contents Wiring diagrams Section: Automatic HVAC System All sections

Heater & Air Conditioning System: Overview Nissan Quest IV

Automatic HVAC System 1 illustration

Component Description

ComponentDescription
EvaporatorThe mist form liquid refrigerant transforms to gas by evaporation by the air conveyed from blower motor. The air is cooled by the heat by evaporation.
CondenserCools refrigerant discharged from compressor, and transforms it to liquid refrigerant.
CompressorIntakes, compresses, and discharges refrigerant, to circulate refrigerant inside the refrigerant cycle.
Refrigerant pressure sensorRefer to " REFRIGERANT PRESSURE SENSOR ".
Liquid tankEliminates foreign matter in refrigerant, and stores temporarily liquid refrigerant.
Expansion valveTransforms high-pressure liquid refrigerant to mist form low-pressure liquid refrigerant by drawing function.

Scheme 1

Scheme 1: System Diagram

Perform Lubricant Return Operation

CAUTIONIf a large amount of refrigerant or lubricant leakage is detected, never perform lubricant return operation.
  1. Start the engine and set to the following conditions. Engine speed: Idling to 1, 200 RPM A/C switch: ON Fan (blower) speed: Maximum speed set Intake door position: Recirculation Temperature setting: Full cold
  2. Perform lubricant return operation for approximately 10 minutes.
  3. Stop the engine.
  4. Lubricant return operation is complete.