Verification

VERIFY THE CUSTOMER CONCERN BY PERFORMING THE FOLLOWING HEATER PERFORMANCE EVALUATION

1. Idle the engine at shop ambient temperature of 60° F (15° C) or higher, until the engine is fully warmed up.

2. Set the front climate temperature control to the hottest setting.

3. Set the mode to panel/vent (with all vents OPEN) and make sure the A/C is switched to the OFF position. Do NOT set the temperature control to the recirculation mode.

4. Set the blower to the highest speed.

5. Idle the engine for 5 minutes with the hood closed.





6. Measure the difference in the discharge air temperature between the left-center vent and the right center vent as shown. The difference should be less than 15° F (8° C) to meet the performance requirement.

If the temperature DIFFERENCE IS LESS than 15° F (8° C), continue with normal Workshop Manual (WSM) diagnostic procedures. Do NOT proceed with this Service Procedure.

If the temperature DIFFERENCE IS MORE than 15° F (8° C), continue to the Service Procedure.