Your Vehicle: 2009 Nissan-Datsun Altima V6-3.5L (VQ35DE)
 
Vehicle » Heating and Air Conditioning » Testing and Inspection » Symptom Related Diagnostic Procedures » Automatic Air Conditioner System » Insufficient Heating  
 
 
  Insufficient Heating  
 

INSUFFICIENT HEATING

Component Function Check

SYMPTOM: Insufficient heating

Inspection FLOW
SYMPTOM: Insufficient heating

  1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE
  1. Press the AUTO switch.
  2. Turn temperature control dial (LH) clockwise until 32°C (90°F) is displayed.
  3. Check for hot air at discharge air outlets. Can a symptom be duplicated?

YES >> GO TO 3
NO >> GO TO 2

  1. CHECK FOR ANY SYMPTOMS Perform a complete operational check and check for any symptoms. Refer to See: Initial Inspection and Diagnostic Overview\Inspection And Adjustment\Description And Conditions\Automatic Air Conditioner.

Does another symptom exist?
YES >> Refer to See: Symptom Matrix Chart.
NO >> System OK.

  1. CHECK FOR SERVICE BULLETINS Check for any service bulletins.

>> GO TO 4

  1. CHECK ENGINE COOLING SYSTEM
  1. Check for proper engine coolant level. Refer to See: Engine, Cooling and Exhaust\Cooling System\Coolant\Testing and Inspection (QR25DE) or See: Engine, Cooling and Exhaust\Cooling System\Coolant\Testing and Inspection (VQ35DE).
  2. Check hoses for leaks or kinks.
  3. Check radiator cap. Refer to See: Engine, Cooling and Exhaust\Cooling System\Coolant\Testing and Inspection (QR25DE) or See: Engine, Cooling and Exhaust\Cooling System\Coolant\Testing and Inspection(VQ35DE).
  4. Check for air in cooling system. >> GO TO 5
  5. CHECK AIR MIX DOOR MOTOR OPERATION Check and verify air mix door mechanism for smooth operation.

Does air mix door operate correctly?
YES >> GO TO 6
NO >> Check the air mix door motor circuit. Refer to See: Component Tests and General Diagnostics\Air Mix Door\Automatic Air Conditioner.

  1. CHECK AIR DUCTS Check for disconnected or leaking air ducts.

Is the Inspection result normal?
YES >> GO TO 7
NO >> Repair all disconnected or leaking air ducts.

  1. CHECK HEATER HOSE TEMPERATURES
  1. Start engine and warm it up to normal operating temperature.
  2. Touch both the inlet and outlet heater hoses. Is the Inspection result normal?

YES >> Hot inlet hose and a warm outlet hose: GO TO 8
NO >> Both hoses warm: GO TO 9

  1. CHECK ENGINE COOLANT SYSTEM Check thermostat operation. Refer to See: Engine, Cooling and Exhaust\Cooling System\Coolant Outlet\Service and Repair (QR25DE) or See: Engine, Cooling and Exhaust\Cooling System\Coolant Outlet\Service and Repair (VQ35DE).

Is the Inspection result normal?
YES >> System OK.
NO >> Repair or replace as necessary.

  1. CHECK HEATER HOSES Check heater hoses for proper installation.

Is the Inspection result normal?
YES >> System OK.
NO >> 1. Back flush heater core.

  1. Drain the water from the system.
  2. Refill system with new engine coolant. Refer to See: Engine, Cooling and Exhaust\Cooling System\Coolant\Service and Repair(QR25DE) or See: Engine, Cooling and Exhaust\Cooling System\Coolant\Service and Repair (VQ35DE).
  3. To retest GO TO 10
  1. CHECK HEATER HOSE TEMPERATURES
  1. Start engine and warm up to normal operating temperature.
  2. Touch both the inlet and outlet heater hoses. Is the Inspection result normal?

YES >> System OK.
NO >> Replace heater core Refer to See: Heater Core\Service and Repair.