Inspection Flow

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Rotate the blower control dial to the low speed.
2. Turn temperature control dial counterclockwise to maximum cold.
3. Check for cold air at discharge air outlets.
Can the symptom be duplicated?

YES

GO TO 3.

NO

GO TO 2.
CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to Work Procedure .

Does another symptom exist?

YES

Refer to Symptom Table .

NO

System OK.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.

Are there any pertinent service bulletins?

YES

Perform service bulletin actions.

NO

GO TO 4.
CHECK FOR DTCS
With CONSULT
1. Turn ignition switch ON.
2. Select "Self Diagnostic Result" mode of "HVAC".
3. Check DTC.
Is any DTC detected?

YES

DTC Index .

NO

GO TO 5.
CHECK DRIVE BELTS
Check A/C compressor belt tension. Refer to Checking Drive Belts (VQ40DE) or Checking (VK56VD).

Is the inspection result normal?

YES

GO TO 6.

NO

Adjust or replace A/C compressor belt. Refer to Removal and Installation (VQ40DE) or Removal and Installation (VK56VD).
CHECK A/C SYSTEM FOR LEAKS
Check A/C system for leaks with fluorescent leak detector. Refer to Checking System for Leaks Using the Fluorescent Dye Leak Detector .

NOTE: Some oil at the A/C compressor high pressure relief valve is normal

Is the inspection result normal?

YES

GO TO 7.

NO

Replace as necessary. If oil residue is at A/C compressor high pressure relief valve, clean and retest at high pressure.
CHECK LOW AND HIGH SIDE PRESSURE
Check A/C high and low side pressure. Refer to Inspection .

Is the inspection result normal?

YES

Check air flow across condenser; check for vehicle equipment installation. If OK, Inspection End.

NO

GO TO 8.
CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE
Check recovery/recycling equipment before connecting to 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 9.
CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?

YES

GO TO 10.

NO

Check contaminated refrigerant. Refer to Working with HFC-134a (R-134a) .
RECHARGE SYSTEM AND CHECK REFRIGERANT PRESSURE
1. Recharge system.
2. Check A/C high and low side pressure. Refer to Inspection .
Is the inspection result normal?

YES

GO TO 11.

NO

Diagnose symptom. Refer to Symptom Table .
CHECK DISCHARGE AIR TEMPERATURE
Check discharge air temperature. Refer to Inspection .

Is the inspection result normal?

YES

Inspection End.

NO

GO TO 12
CHECK AIR MIX DOOR OPERATION - TEMPERATURE INCREASE
1. Rotate temperature control dial clockwise until maximum hot.
2. Check for hot air at appropriate discharge air outlets.
Is the test result normal?

YES

GO TO 13.

NO

Check front air mix door for mechanical failure. Refer to Removal and Installation - Front Air Mix Door Motor .
CHECK AIR DUCTS
Check ducts for air leaks.

Is the inspection result normal?

YES

System OK.

NO

Repair air leaks. Refer to Exploded View .