I have a loud tapping noise coming from teh dashboard of my 2003 Chevy Trailblazer.
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
If it is coming from under the dash it could be the speedometer cable.
whem does it happen? a certain mph? certain road? bump? under acceleration?
No speedometer cable
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.
It's the mode actuator in the vent system. Whenit goes out and stops tapping air will only blow through the floor vents.
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