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Dash emits a repeated tic-toc sound



Alright now. Yet another problem with this 2003 Yukon, 5.3L Z71, 55,000miles. A tic-toc sound - very methodical like a loud clock comes from the driver's side dashboard. It comes on after a few miles of driving ans stays on until the engine is turned off. It even stays on when the vehicle is at a stop light. Kinda like my own little drummer along for the ride.


Any ideas on what it is, what causes it and what the fix is.





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It's one of the A/C door actuators. While it's making the noise, try moving the temp lever (or knob) to a different position and see if it momentarily stops as the temp is changed. Or, it may go away for a while.


If that does nothing, try chaning the mode (upper vents, lower, bi-level, etc.) to see if that affects it.


We mostly see the left temp actuator and/or the mode actuator cause this problem. Hopefully, it's no the right temp actuator as that requires several hours labor to replace.

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