Insufficient Heating

TROUBLE DIAGNOSIS

Insufficient Heating

SYMPTOM: Insufficient heating

INSPECTION FLOW


1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE

1.Turn temperature control dial clockwise to maximum heat position.
2.Check for hot air at discharge air outlets.
Is the inspection results normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Operational Check.
Does another symptom exist?
YES- How To Perform Trouble Diagnosis For Quick And Accurate Repair.
NO- System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.
- GO TO 4.

4. CHECK COOLANT SYSTEM

1.Check engine coolant level. Inspection.
2.Check hoses for leaks or kinks.
3.Check Radiator cap. Testing and Inspection.
OK or NG
OK- GO TO 5.
NG- Repair/replace as necessary.

5. CHECK AIR MIX DOOR CABLE

Check air mix door cable operation. Air Mix Door Cable Adjustment.
OK or NG
YES- GO TO 6.
NO- Adjust or replace air mix door cable. Air Mix Door Cable Adjustment.

6. CHECK AIR DUCTS

Check ducts for air leaks.
OK or NG
OK- GO TO 7.
NG- Repair air leaks.

7. CHECK HEATER HOSE TEMPERATURES

1.Start engine and warm it up to normal operating temperature.
2.Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be warm.
Is the inlet hose hot and the outlet hose warm?
YES- GO TO 8.
NO- Both hoses warm: GO TO 9.

8. CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check engine control temperature sensor. P0117.
OK or NG
OK- System OK.
NG- Repair or replace as necessary. Retest.

9. CHECK HEATER HOSES

Check heater hoses for proper installation.
OK or NG
OK- GO TO 10.
NG- Repair /replace as necessary. Retest GO TO 7.

10. BACK FLUSH HEATER CORE

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.Start engine and warm it up to normal operating temperature.
5.Touch both the inlet and outlet heater hoses. The inlet hose should be hot and the outlet hose should be warm.
Is the inlet hose hot and the outlet hose warm?
YES- System OK.
NO- Replace heater core and refill engine coolant. Service and Repair.