Nissan Sentra B18 (2020-2025) Service Manual: Operation Inspection

Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Automatic Air Conditioner / Basic Inspection / Operation Inspection

Work Procedure

Work Procedure

DESCRIPTION

The purpose of the operational check is to check that the individual system operates normally.

Conditions

: Engine running at normal operating temperature

INSPECTION PROCEDURE

CHECK MEMORY FUNCTION
1. 1. Start the engine.
  2. Operate the temperature control switch (driver side) and raise the temperature setting to 89°F or 90°F (32°C).
  3. Press the OFF switch.
  4. Ignition switch OFF.
  5. Ignition switch ON.
  6. Press the AUTO switch.
  7. Check that the temperature setting, before placing the ignition switch OFF, is stored.
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Check power and ground circuits for A/C auto amp. Refer to Diagnosis Procedure.
CHECK BLOWER MOTOR SPEED
1. 1. Operate the fan control dial. Check that the fan speed changes.
  2. Check the operation for all fan speeds.
Is the inspection result normal?
YES >>
GO TO 3.
NO >>
Check blower motor system. Refer to Diagnosis Procedure.
CHECK DISCHARGE AIR (MODE SWITCH AND DEF SWITCH)
1. 1. Press the MODE switch and the DEF switch.
  2. Check that the air outlets change according to each indicated air outlet by placing a hand in front of the outlets. Refer to System Description.
  Note:
  Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at FRE () (REC position is not selected) when the D/F () or DEF () is selected.
Is the inspection result normal?
YES >>
GO TO 4.
NO >>
Check mode door system. Refer to Diagnosis Procedure.
CHECK INTAKE AIR
1. 1. Press REC () switch one time. REC indicator should illuminate.
  2. Listen to the sound of the air coming out of the vent.
  3. Press REC () switch one more time. REC indicator should go off.
  4. There should be an audible change to the sound of the air flowing out of the vent.
  Note:
  Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and the FRE () door is open (REC position is not selected) when the D/F () or DEF () is selected.
Is the inspection result normal?
YES >>
GO TO 5.
NO >>
Check intake door system. Refer to Diagnosis Procedure.
CHECK A/C SWITCH
1. 1. Press the A/C switch.
  2. The A/C switch indicator is turned ON.
    
    Confirm that the A/C compressor clutch engages (sound or visual inspection).
Is the inspection result normal?
YES >>
GO TO 6.
NO >>
Check magnet clutch system. Refer to Diagnosis Procedure.
CHECK TEMPERATURE DECREASE
1. 1. Operate the A/C compressor.
  2. Operate the temperature control switch (driver side) and lower the temperature setting to 60°F or 61°F (18°C).
  3. Check that the cool air blows from the outlets.
Is the inspection result normal?
YES >>
GO TO 7.
NO >>
Check for insufficient cooling. Refer to Diagnosis Procedure.
CHECK TEMPERATURE INCREASE
1. 1. Operate the temperature control switch (driver side) and raise the temperature setting to 89°F or 90°F (32°C) after warming up the engine.
  2. Check that the warm air blows from the outlets.
Is the inspection result normal?
YES >>
GO TO 8.
NO >>
Check for insufficient heating. Refer to Diagnosis Procedure.
CHECK DUAL MODE FUNCTION
1. 1. Press the DUAL mode switch, and then check that “DUAL” is shown on the display.
  2. Operate the temperature control switch (driver side). Check that the discharge air temperature (driver side) changes.
  3. Operate the temperature control switch (passenger side). Check that the discharge air temperature (passenger side) changes.
  4. Press the DUAL mode switch, and then check that the temperature setting (driver/passenger) is unified to the driver side temperature setting.
Is the inspection result normal?
YES >>
GO TO 9.
NO >>
Refer to Diagnosis Chart By Symptom and perform the appropriate diagnosis.
CHECK AUTO MODE
1. 1. Press the AUTO switch, and then check that “AUTO” is shown on the display.
  2. Operate the temperature control switch (driver side). Check that the fan speed, outlet air or intake air changes. The discharge air temperature or fan speed varies depending on the ambient temperature, in-Nissan Sentra vehicle temperature, and temperature setting.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Refer to Diagnosis Chart By Symptom and perform the appropriate diagnosis.

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