Inspection Flow

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

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

YES: GO TO 2.

NO: Perform complete system operational check. Refer to "OPERATIONAL CHECK (FRONT) ".
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.

GO TO 3.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis. Refer to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION ".

OK or NG

OK: GO TO 4.

NG: Refer to "SELF-DIAGNOSIS CODE CHART ".
CHECK ENGINE COOLING SYSTEM
1. Check for proper engine coolant level.
2. Check hoses for leaks or kinks.
3. Check radiator cap.
4. Check for air in cooling system.
  GO TO 5.
CHECK HEATER PUMP
1. Rotate temperature control dial to full hot 32°C (90°F).
2. Rotate fan control dial counterclockwise to maximum speed.
3. Heater pump should be activated.
OK or NG

OK: GO TO 6.

NG: Check heater pump circuit. Refer to "HEATER PUMP CIRCUIT ".
CHECK AIR MIX DOOR OPERATION
Check the operation of the air mix door.

OK or NG

OK: GO TO 7.

NG: Check the air mix door motor circuit. Refer to "AIR MIX DOOR MOTOR CIRCUIT ".
CHECK AIR DUCTS
Check for disconnected or leaking air ducts.

OK or NG

OK: GO TO 8.

NG: Repair all disconnected or leaking air ducts.
CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
OK or NG

OK: Hot inlet hose and a warm outlet hose: GO TO 9.

NG: Both hoses warm: GO TO 10.
CHECK ENGINE COOLANT SYSTEM
Check engine control temperature sensor. Refer to "DTC P0117, P0118 ECT SENSOR ".

OK or NG

OK: System OK.

NG: Repair or replace as necessary. Retest.
CHECK HEATER HOSES
Check heater hoses for proper installation.

OK or NG

OK: System OK.

NG:
1. Back flush heater core.
2. Drain the water from the system.
3. Refill system with new engine coolant. Refer to "CHANGING ENGINE COOLANT ".
4. GO TO 11 to retest.
CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
OK or NG

OK: System OK.

NG: Replace heater core. Refer to "HEATER CORE ".