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When I start the truck, I get a knocking/clicking sound behind the upper dash on the passenger side. Turned off the heater and can still hear the sound. Popped the hood, and nothing is loose behind the washer fluid or coolant and brake lines are tight. Looked behind the glove box and nothing seems loose. It’s not a metal clicking sound. The knocking gets a little faster as speed increases. Truck runs fine and I’m not getting any codes. What can this be? :unsure:

I have an ’08 extended cab, I4, 2wd truck
 

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I had a clicking sound in the same location as you. My noise turned out to be the motor that moves the re-circulation door. It has plastic gears and it was slipping.
 
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