A/C, Interior - Rattle from Dash With Heater ON

13-033

April 13, 2013

Applies To:
2012 Civic - ALL 2012 Civic Hybrid -ALL
2012 Civic Natural Gas - ALL

Buzz or Rattle From the Dash When the Heater Is On

SYMPTOM

A buzz or raffle is heard from the dash when the heater is on low to medium fan speed.

POSSIBLE CAUSE

The air mix door is warped.

CORRECTIVE ACTION

Replace the heater sub-assembly.





PARTS INFORMATION

REQUIRED MATERIALS

Coolant: P/N 0L999-9011 (1.5 gallons required)

WARRANTY CLAIM INFORMATION





The normal warranty applies.

Failed Part: P/N 791 06-TRO-A02

Defect Code: 00401

Symptom Code: 00101

Skill Level: Repair Technician

REPAIR PROCEDURE

1. Remove the heater sub-assembly:

^ Online, enter keywords HEATER CORE, and select Heater Unit/Core Removal and Installation (Heating) or (Natural Gas models)
or (With A/C) from the list.

NOTE:

^ It is not necessary to remove the steering wheel; the steering column can be removed with the steering wheel attached.

^ It is not necessary to remove the passenger airbag from the steering beam hanger; the dashboard and hanger can be removed as an assembly.

^ You must replace the A/C pipe 0-rings.

^ Before removing the heater unit, make sure the HVAC controls are set to MAX COOL and VENT air delivery mode. This is required to properly position the air mix and mode control motors for removal and transfer to the new heater unit.





2. With A/C: Carefully remove the evaporator core without bending the evaporator temperature sensor.





3. Remove the heater pipe bracket and the grommet. Carefully pull out the heater core.





4. Remove the air mix control motor.

5. Remove the mode control motor.

6. Install the heater core, the heater pipe bracket, and the grommet into the new heater sub-assembly.

> heater sub-assembly

7. Models with A/C: Reinstall the evaporator core with the two new 0-rings.

> 0-ring 5/8"

> 0-ring 8mm

8. Install the mode control motor.





9. Align the air mix control motor with the gear, then install the motor onto the new sub-assembly.

10. Reinstall all removed parts.

^ Online, enter keywords HEATER CORE, and select Heater Unit/Core Removal and Installation (Heating) or (Natural Gas models) or (With A/C) from the list.





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