I have a loud tapping noise coming from teh dashboard of my 2003 Chevy Trailblazer.

Asked by Sep 14, 2008 at 09:54 AM about the 2003 Chevrolet TrailBlazer LT 4WD

Question type: Maintenance & Repair

Can you tell me what could be causing this?

6 Answers

105

are you sure its not coming from under the hood a tapping noise usually denote at motor problem but it could also be the a/c relay not working correctly

65

If it is coming from under the dash it could be the speedometer cable.

355

whem does it happen? a certain mph? certain road? bump? under acceleration?

355

No speedometer cable

195

Is it from the left side or the right side of the dash? Does it increase intensity when you turn your fan up? It could be something stuck in the blower motor.

3 out of 3 people think this is helpful.
50

It's the mode actuator in the vent system. Whenit goes out and stops tapping air will only blow through the floor vents.

5 out of 5 people think this is helpful.

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