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John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience:  A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
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2006 Chevy Impala scan codes B0223, B0408, B0418 with loud

Customer Question

2006 Chevy Impala scan codes B0223, B0408, B0418 with loud ratcheting noise under center dash when temp selected full cold.
Submitted: 5 years ago.
Category: Chevy
Expert:  John replied 5 years ago.

HelloCustomer

The body computer codes are an indication of a problem with the circuits that maintain your a/c system & is most likely a failed actuator.This is the noise you hear ,the actuators internal plastic gears have failed.The circuit/system description is :

The HVAC control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of two driver circuits. The HVAC control module supplies the actuator motor with a 12-volt driver control circuit and a ground driver control circuit. The HVAC module controls the direction of the actuator door by changing the polarity of the control circuits.

John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience: A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
John and 12 other Chevy Specialists are ready to help you
Customer: replied 5 years ago.
Good answer. Are these actuators fairly easy to change, and if so, where are they located?
Expert:  John replied 5 years ago.

To replace the mode actuator( which is in the center of the dash) the instriment panel compartment inner panel must be removed.Here is some help.

Instrument Panel Compartment Inner Panel Replacement (Impala)
Object Number:(NNN) NNN-NNNN Size: MF

Callout

Component Name

Preliminary Procedures

  1. Remove the Instrument Panel Compartment Door Assembly. Remove the Right Side Instrument Panel Closeout/Insulator. Remove the Right Side Carpet Retainer. Remove the Instrument Panel Right Hand Outer Trim Cover. Remove the Instrument Panel Trim Plate Right Outer Screw.

1

Instrument Panel Compartment Inner Panel Screws (Qty 7)

Tighten
2 N·m (18 lb in)

2

Instrument Panel Compartment Inner Panel Assembly

Tip
Flex the bottom right hand corner of the Instrument Panel in order to remove the Instrument Panel Compartment Inner Panel Assembly.

 

 

Mode Valve Actuator Replacement (Impala)
Object Number:(NNN) NNN-NNNN Size: MF

Callout

Component Name

Preliminary Procedure

  1. Remove the instrument panel (I/P) inner panel. Disconnect the mode actuator electrical connector.

1

Mode Actuator Screw (Qty: 2)

.

Tighten
1.5 N·m (13 lb in)

2

Mode Actuator

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