Causes of Clicking Noise in Car Dashboard When AC is on

December 13, 2023

Normally your car’s HVAC system (heating, ventilation, and air conditioning) should work quietly. But, sometimes you may hear strange noises coming from the dashboard. Oftentimes this type of noise can be caused by a mechanical part that’s loose or has become damaged. The good news is that a clicking sound can usually be fixed with some simple troubleshooting.

The most common reason for a clicking sound in your dashboard is that the blend door motor isn’t working properly. The blend doors are what change the position of your air vents depending on which setting you have the AC on, whether recirculation is on or not, etc. The climate control head is what controls when the blend door motor moves based on your inputs. If the actuator becomes stuck or the motor fails, it will make a clicking sound in your dashboard.

Another cause of a clicking sound could be that there’s something rattling around inside your air vents. If your kids put stuff up on the dash, like pens or paper clips, this can create a rattling sound when they move. This is a quick and easy fix, simply remove whatever is rattling in the vents.

Another common cause of a clicking sound in your dashboard is that one of the relays in your car is bad. A bad relay can make a clicking sound continuously, even when the car is turned off. To check for this, go to the fuse box and pull the fuse that’s connected to your air conditioner controller. This will disconnect all the electrical parts from the AC system for 1 or 2 minutes and reset everything.

Mission

Traffic Dave is on a mission to help traffic engineers, transportation planners, and other transportation professionals improve our world.
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram