How to Tell if Something More is Going On The entire motor itself can even breakdown, and if it stops working completely, then it can also click. If the air isn’t moving, you may notice it first by a clicking or knocking sound. All of that is controlled by an electric motor known as a blend door actuator.Īn actuator is meant to move the air in the right direction, but it can, unfortunately, become stuck or even break. The blend door, also known as the vent door, mixes up the cool air and warm air that goes to your vents. At the same time, it might mean there’s a leak somewhere causing a frequent, audible fluctuation. This doesn’t always mean it’s a larger problem. The compressor in your A/C can cycle on and off, and sometimes, you may actually hear this process going on. There aren’t too many parts in an A/C that will click, so it’s relatively simple to narrow down the possible causes of a clicking sound: compressor cycling or blend door issues. When you hear noise from the dashboard, it’s typically the A/C system. Let’s take a look at what could be the culprit so you can get on track to rectifying the problem. So, what exactly causes such knocking or clicking from the dashboard? It’s natural for us to get a little worried whenever we hear strange sounds, and, indeed, any new noise should always be investigated. You start up your car, ready to go, and you hear some type of clicking or knocking noise around the dashboard.
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