Clicking noise when using external air on 2008 Pontiac Vibe?
Heater and A/C both work fine in the vehicle when using internal air, but when I want to defog the window or bring in outside air I get a rapid clicking noise coming from under the dash. Sounds like there is a switch that is trying to click open but is stuck, possibly something with the divider gate that switches where the airflow is coming from. Not sure how to better diagnose or how to get into the dash though.
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