A/C makes clapping sound whe changeing vent
 

Hi, my 2000 Grand Voyager has recently had the A/C evaporator core replaced. Now when I change the vent from face level to anything else like windshield it makes a loud clap sound. Other than taking it back for the workshop to fix can anyone tell me what is making that sound.
Thanks in advance.
[align=left] [/align]

RE: A/C makes clapping sound whe changeing vent
 

that would be the doors slaming onto the HVAC housing they did not put back foam between the doors.