Nissan Maxima Service and Repair Manual: Heater & air conditioning system

  • Precaution
  • PRECAUTIONS Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

  • Preparation
  • PREPARATION Special Service Tool The actual shapes of the tools may differ from those illustrated here. HFC-134a (R-134a) Service Tool and Equipment Do not mix HFC-134a (R-134a) refrigerant and/or its specified oil with CFC-12 (R-12) refrigerant and/or its oil. Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/oil. Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles refrigerant and/or oil) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed use of the refrigerants/oil.

  • System description
  • REFRIGERATION SYSTEM Refrigerant Cycle Refrigerant flow Compressor Pressure relief valve Liquid tank Refrigerant pressure sensor Condenser Expansion valve Evaporator Blower motor High-pressure gas  High-pressure liquid  Low-pressure liquid  Low-pressure gas  Suction port  Discharge port Outside air The refrigerant from the compressor flows through the condenser with liquid tank, the evaporator and returns to the compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.

  • Basic inspection
  • DIAGNOSIS AND REPAIR WORK FLOW WITH COLOR DISPLAY WITH COLOR DISPLAY : How to Perform Trouble Diagnosis For Quick And Accurate Repair WORK FLOW 1.LISTEN TO CUSTOMER COMPLAINT Interview the customer to obtain as much information as possible about the conditions and environment under which the symptom occurs. 2.CHECK FOR SERVICE BULLETINS Check for any service bulletins 3.CHECK FOR HVAC DTCS WITH CONSULT Using CONSULT, perform "SELF-DIAGNOSIS RESULTS" of HVAC. 4.CHECK FOR AUDIO DTCS WITH CONSULT Using CONSULT, perform "SELF-DIAGNOSIS RESULTS" of MULTI AV 5.PERFORM OPERATIONAL CHECK Verify the symptom with operational check based on the information obtained from the customer. 6.

  • Symptom diagnosis
  • REFRIGERATION SYSTEM SYMPTOMS WITH COLOR DISPLAY WITH COLOR DISPLAY : Trouble Diagnoses for Abnormal Pressure Whenever system′s high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperatureto- operating pressure table).

  • Periodic maintenance
  • Removal and installation
  • COMPRESSOR Removal and Installation for Compressor REMOVAL CAUTION: Before servicing, turn the ignition switch off, disconnect both battery terminals and wait at least three minutes. Disconnect the battery negative and positive terminals. Refer to PG-67, "Removal and Installation (Battery)" Discharge the refrigerant. Refer to HA-28, "Recycle Refrigerant". Partially drain the engine cooling system. Refer to CO-11, "Changing Engine Coolant". Remove the front RH wheel and tire using a power tool. Refer to WT-60, "Adjustment". Remove the engine under cover. Refer to EXT-15, "Exploded View". Remove the RH fender protector side cover and the RH fender protector.

  • Service data and specifications (SDS) 
  • SERVICE DATA AND SPECIFICATIONS (SDS) Compressor    Oil  Refrigerant

Blower unit