Skip the auto shop - Our mechanics make house calls

Q: Annoying noise when I set the AC

asked by on

I own a 2011 Ford F-150 3.2L V6, automatic transmission, with 58k miles. Earlier this week while I was driving on the highway, I attempted to turn the A/C to its coolest setting by turning the knob all the way to the end of the blue (cool) side. A clicking noise came on and wouldn't stop until I rotated the knob back into the red (warm) range of the control. The noise doesn't occur unless the knob is rotated completely to the cold side. This is annoying and embarrassing with other people in the car since sometimes I want to run the A/C on its coolest setting and its uncomfortable otherwise. Help, please.

It sound to me you are have an issue with the temperature electronic blend door actuator that controls the temperature coming out of the vents of your A/C. To properly diagnose this, YourMechanic would have to scan your truck’s computer system to see if you have what we call body codes that pertain to the body computer and components of this system. If codes are present then a pinpoint test will narrow the source of the problem to a component that is causing your clicking issue. This problem is most likely the actuator mentioned earlier. You want to check that the actuator has actually failed since it is costly to replace. The actuators location, if you have only one temperature control knob, is in the dash behind the radio, on top of the A/C evaporator case. If you have dual temperature control then there are two actuators. The one for the left side is behind the dash, and the one for right side is behind the radio. This is common to a lot of automobiles and not just Ford. These actuators all are similar in design and have similar failures.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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 read tires for information?

Reading the tires on your truck is important. It helps you understand what conditions are needed to get the most out of your tires and operate your vehicle safely. To read the tires. The size of the tire will...

Q: How do you operate the headlamps?

Your car’s headlamps (or headlights, if you prefer) are vital for driving during any time when visibility is low. That includes nighttime driving, dusk, dawn and driving during inclement weather (snow, rain, fog, etc.). Of course, you’ll need to know...

Q: AC issue - 2008 Dodge Charger

Hi there. If the compressor is turning on and if the pressures are correct, then the lines need to be checked. If one of the lines going into the firewall are cold then the system may be working fine. If...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...