1971 Mach 1 fastback unknown part under dash

JJHstang

Member
Sep 12, 2018
91
4
8
Fort Worth, TX
I was cleaning my floor on my 71 Mach 1 fastback. That I have had for 1.5 years. Was on the passenger side, looked up and saw a piece of hollow black plastic. It is loose and runs under the dash to the drivers side. I couldn't remove it but as mentioned it is loose and on the drivers side is larger and no opening. I started the car and tested the vents and defrost. Air seems to blow ok.
I have attached a picture. Can anyone tell me what it is for?
 

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