Skip the auto shop - Our mechanics make house calls

Q: Too much noise coming from the AC

asked by on

The heater/AC in my 2007 Chevrolet Impala makes a horrible clicking noise sometimes. I have read that the actuators can fail and cause that issue. How big of a repair is this? I hear the clicking from deep inside the dashboard, so it sounds expensive. This car has 59,000 miles on it and I don’t know if I even want to pay to have the parts looked at if it involves taking the dash out! What can I do?

A: The A/C system in your vehicle has electron...

The A/C system in your vehicle has electronic blend door and temperature control actuators that are prone to failure. When these parts fail, the vehicle occupant(s) will experience either one of the following results: the occupant(s) will not have control of where air blows out as air will blow into the vehicle from only one position or there may be a clicking noise when changing air direction. The same could happen when trying to control temperature. The actuators are little motors with two wires attached. The motor stops working or the motor gets weak and the a/c module keeps running the motor when the blend door gets to the stop mode and you just hear clicking. The fix is to replace the actuator that is failing. Before replacement of actuator you could try to set the calibration of the actuator again through a Tech 2 scanner. The module counts the pulses of the motor to determine door position. I have found that a failing actuator most of the time will need to be replaced and reprogrammed to work properly again. The actuator is located on the left side of the evaporator case and will require removal of the dash assembly to gain access to replace sensor. The new sensor will need to go through the reprogramming with the Tech 2 scanner. Note that the temperature door actuators should be checked and replaced during mode door actuator replacement.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I use the automatic climate control setting?

When your climate controls are in automatic mode, then the air outlets and fan speed will be automatically adjusted based on the temperature at which you set the vehicle. To use the automatic climate control setting, simply press the Auto...

Q: My temperature gauge rises then goes back down.

This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know, the coolant fan switch helps to maintain the proper coolant temperature by turning...

Q: ticking noise comimg from underneath ticks in all gears but 4th and only when clutch is out

If everything else looks good, there is one other thing that can create such a sound. Of course this forum is not replacement for a technician being present to diagnose the problem. What you need to check for next is...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.