Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. Symptoms of a Bad or Failing AC Control Switch

Symptoms of a Bad or Failing AC Control Switch

AC Control Switch

The AC control switch is a very important component of the AC system. It is the physical switch that allows the user to turn on and change the settings of the AC system from inside of the vehicle. It is usually a custom panel with knobs and buttons that allow the user to control the functions of the AC system, such as setting, temperature, and intensity of the fans. Aside from allowing the user manual control over the AC system, the switch can also sometimes serve to control and regulate certain functions automatically.

The AC control switch is basically the user’s control surface for the AC system. When there is a problem with the switch, it can cause all sorts of problems and quickly take away from the functionality of the AC system, so it should be inspected as soon as possible. Same as with most components, there will usually be a few warning signs that will help inform the driver if the AC control switch has failed, or is beginning to fail.

1. Overheating AC parts

One of the first signs that the AC control switch may be having a problem is that certain parts of the AC may overheat. The AC control switch is essentially an electronic circuit board with knobs and switches. In certain cases, the switch may short circuit or develop a resistance problem, which may cause the switch itself to overheat. It may become hot to the touch and begin to malfunction or not function at all.

The switch also distributes power to other AC components. Therefore, a problem with the switch may cause other components to overheat, due to excessive power or heat. Usually when a switch is hot to the touch, it has malfunctioned and needs to be replaced.

2. Certain settings not working or working intermittently

As the AC control switch is an electrical switch, it contains electrical contracts and knobs that can wear and break. A broken knob or completely worn out electrical contact inside of the switch may cause one or more of the settings not to work, or to work intermittently. Usually, the switch must be replaced if this occurs.

3. AC compressor not coming on

Another symptom that may present itself when the AC control switch has failed, is the compressor not coming on. The AC control switch is what powers and controls the AC compressor, as well as the entire system. If it is not working properly, then the AC compressor may not come on, which will prevent the AC from blowing cold air.

In most cases a bad or failing AC control switch will display noticeable symptoms that hint that there is a problem with the switch. If you suspect that your switch has failed, have it diagnosed by a professional technician, such as one from YourMechanic. They will be able to inspect your system and replace your AC control switch if necessary.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
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...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...

Related questions

Q: Fuel and temperature gauge needles stopped working

Hello. We will be happy to assist you. I believe that the entire instrument cluster may be faulty. It is highly unlikely that nearly all of the gauges will fail at once. I suggest that you have a technician inspect...

Q: disaster

Leaks can be repaired and some leaks are frankly trivial issues in terms of difficulty of repair and cost. So, it's only a disaster if it's a "bad" leak where bad means "costly" to repair. As long as you didn't...

Q: Q: neutral safety switch

In your application, the switch is in the passenger compartment. Of course, prior to replacing it, be sure it is really faulty. There is a test protocol in the Factory Service Manual and you can request that those steps be...