Inspection Flow

WARNING: This page is about a different car, the 2008 Nissan Maxima. 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 ".
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.

: GO TO 3.
PERFORM FRONT AIR CONTROL SELF-DIAGNOSIS
Perform front air control self-diagnosis. Refer to "FRONT AIR CONTROL SELF - DIAGNOSIS ".

OK or NG

OK: GO TO 4.

NG: Perform power and ground circuit for front air control. Refer to "POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL AND UNIFIED METER AND A/C AMP .".
PERFORM SELF-DIAGNOSIS STEP - 2
Perform self-diagnosis STEP - 2. Refer to "FUNCTION CONFIRMATION PROCEDURE ".

OK or NG

OK: GO TO 5.

NG: Perform appropriate malfunctioning sensor circuit.
PERFORM SELF-DIAGNOSIS STEP - 4
Perform self-diagnosis STEP - 4. Refer to "FUNCTION CONFIRMATION PROCEDURE ".

OK and NG

OK: GO TO 6.

NG:
- Check LAN system circuit. Refer to "LAN SYSTEM CIRCUIT ".
- Check blower motor circuit. Refer to "BLOWER MOTOR CIRCUIT ".
CHECK ENGINE COOLING SYSTEM
1. Check for proper engine coolant level. Refer to "CHECKING RESERVOIR LEVEL ".
2. Check hoses for leaks or kinks.
3. Check radiator cap. Refer to "CHECKING RADIATOR CAP ".
4. Check for air in cooling system.
OK or NG

OK: GO TO 7.

NG: Repair as necessary.
CHECK AIR MIX DOOR OPERATION
Check the operation of the air mix door.

OK or NG

OK: GO TO 8.

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 9.

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 10.

NG: Both hoses warm: GO TO 11.
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 12 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 ".