FWIK, the HVAC door/doors failure is a common problem on these Dodge trucks. I pulled the dash on my 2004 truck because I could not get heat. Upon inspection of the factory doors, every door plastic was busted or completed broken in one form or another. The foam was in pretty sorry condition also. I replaced all the doors with the heater treater doors and everything works perfectly now. Once it's done with the heater treater doors I don't think it will break again.