On the dash in the middle by the clock.there is a clicking noise.it starts when I put the key in the ignition .dosnt stop instill it is put in drive plz help me win this bet lol

Thank you for such a well written question. I hope my answer is as such. Problem: HVAC Mode Control Module Here's how it works: On cold start, most drivers back through their exhaust fumes. Cars are designed to automatically close off the cabin from outside air when you enter Reverse gear. The little servo motor is trying to close the vent door but the gears are stripped. It just keeps trying and trying, making that clicking grinding noise. When you put the car in Drive, the system reverts to Fresh Air Mode and the grinding stops. Common problem on an otherwise well designed Chrysler 300. It's a 1 day fix that costs 220.00.