2006 Chevrolet Impala. Question: What could be the problem with a ticking noise coming from the dashboard. sounds like a machine gun. Ive heard that it could be an air duct flapping out of control. The ticking begins whenever i use my air or heat controls

 

Answer: Yes, this sounds like one of the heater / AC door motors is making the noise. There are several in the dash. There is a motor, also called an actuator, for the mode selection- defrost, floor or vent position. There is also one for the temperature door or doors if you have dual zone A/C. Then there would be one for each side. There is a also one for the blend door, which works in conjunction with the mode door.

 

Determining which one is noisy can be difficult. With a scan tool that can read HVAC data, you would be able to see the position of the door motors as a numeric value, then you could see the one that is moving around. Most people of course do not have this scanner, and only some of the higher end local shops would. The dealer definitely does. You could try switching positions on the control unit to floor, vent, defrost, hot cold, etc and try to pick out the one that is making the noise.

 

Leave your comments

Post comment as a guest

0 / 300 Character restriction
Your text should be in between 10-300 characters
    • Guest

      Will a/c work with one of the motors unplug

    • Mechanic Joe

      In reply to: Guest

      Yes, the A/C will work fine. With one of the motors unplugged, just that side will not function properly.

    How Things Work

    Baisic Starting System Function and Operation

    The cranking circuit consists of the battery, starter motor, ignition switch, and related wiring.

    These starter motors are not serviceable and are replaced as assemblies only.

    Most of today's starter motors are non-repairable starter motors. They have pole pieces that are arranged around the armature within the starter housing. When the solenoid windings are energized, the pull-in winding circuit is completed to ground through the starter motor.

    Read more...

    Common Engine Codes

    Oxygen Sensor Code P0036 and P0056

    P0036 - P0056
    Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensor to reach operating temperature.

    Read more...

    Latest Articles

    1997 Volkswagon Overheating | ...

    Question: 1997 VW sedan Polo Classic.Engine Size : 1600ccQuestion: Every time I start the engine approximately 10-15 minutes idle, the temp indicator ...

    Growling Noise Comes And Goes

    Question: I have a 2002 buick century custom that makes a growling noise off and on at low speeds. I can be going straight or turning, speeding up or ...

    Ford Escort ZX2 Rough Idle ...

    Question: : I have a '98 ford escort zx2 with a 5-speed transmission. I was stopped at a stop sign the other when my car started to buck and jerks. ...