Nissan Sentra B18 (2020-2025) Service Manual: Insufficient Cooling

Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Manual Air Conditioner / Symptom Diagnosis / Insufficient Cooling

Component Function Check

Component Function Check

SYMPTOM: Insufficient cooling

INSPECTION FLOW

CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
1. 1. Press the A/C switch.
  2. Turn temperature control dial counterclockwise to maximum cold.
  3. Check for cold air at discharge air outlets.
Can a symptom be duplicated?
YES>>
GO TO 3.
NO>>
GO TO 2.
CHECK FOR ANY SYMPTOMS
1. Perform a complete operational check and check for any symptoms. Refer to Work Procedure.
Does another symptom exist?
YES>>
Refer to Symptom Table.
NO>>
System OK.
CHECK FOR SERVICE BULLETINS
1. Check for any service bulletins.
>>
GO TO 4.
CHECK DRIVE BELTS
1. Check A/C compressor belt tension. Refer to Inspection.
Is the inspection result normal?
YES>>
GO TO 5.
NO>>
Replace A/C compressor belt. Refer to Removal and Installation.
CHECK AIR MIX DOOR MOTOR OPERATION
1. Check and verify air mix door mechanism for smooth operation.
Does air mix door operate correctly?
YES>>
GO TO 6.
NO>>
Check air mix door motor circuit. Refer to Diagnosis Procedure.
CHECK COOLING FAN MOTOR OPERATION
1. Check and verify cooling fan motor for smooth operation.
Does cooling fan motor operation correctly?
YES>>
GO TO 7.
NO>>
Check cooling fan motor. Refer to Component Function Check.
CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE
1. Check recovery/recycling equipment before connecting to Nissan Sentra vehicle. Verify there is no pressure in the recovery/recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.
>>
GO TO 8.
CHECK REFRIGERANT PURITY
1. 1. Connect recovery/recycling equipment to Nissan Sentra vehicle.
  2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?
YES>>
GO TO 9.
NO>>
Check contaminated refrigerant. Refer to Description.
CHECK REFRIGERANT PRESSURE
1. Check refrigerant pressure with manifold gauge connected. Refer to Inspection.
Is the inspection result normal?
YES>>
Perform diagnostic work flow. Refer to Workflow.
NO>>
GO TO 10.
CHECK FOR EVAPORATOR FREEZE UP
1. Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES>>
Perform diagnostic work flow. Refer Workflow.
NO>>
GO TO 11.
CHECK AIR DUCTS
1. Check ducts for air leaks.
Is the inspection result normal?
YES>>
System OK.
NO>>
Repair air leaks.

Heater and Air Conditioning System Control Symptoms

Symptom Table Symptom Table SYMPTOM TABLE Symptom Reference Page ...

Insufficient Heating

Component Function Check Component Function Check SYMPTOM: Insufficient heating INSPECTION FLOW CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE ...

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