All of a sudden there is a loud clunking noise coming from the dash of my 2005 Ford Explorer.


  • It definitely sounds cyclical.
  • Exists only when climate control system is ON.
  • Sound diminishes in frequency and intensity as you turn the temperature dial towards cold(blue). And, vice versa, is loudest and more frequent with the dial turned all the way in the red.
  • 1
    Check the blend door actuator. – CharlieRB Apr 7 '17 at 14:02
  • 1
    Like @CharlieRB said ... but there is probably more than one you'd have to check. More than likely three is what I'm thinking. You could narrow this down by seeing when it makes the noise by changing the settings on the climate control. Try turning the heat all the way up, leave it there for about 10 seconds, then turn it all the way down. If you hear it then, it's probably the heat/cool door actuator. Turn the inside/outside button on off in the same manner. If there is side to side control, play with those. By doing this you can narrow down which one it is most likely. – Pᴀᴜʟsᴛᴇʀ2 Apr 7 '17 at 15:23

I have had the same problem with my car. If it is a knocking sound under the dashboard once you turn on the ignition and air is only blown in the dashboard and floor, you can change the module that controls the A/C. If that does not work it may be due to a bad mode actuator that needs to be replaced.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.