1971 duster

“Comeback ‘Cuda” Heater Box Reboot: Rebuilding an E-body Non-A/C Heater Box - Mopar Connection Magazine | A comprehensive daily resource for Mopar enthusiast news, features and the latest Mopar tech


Sorry it's been a while since I did mine. One of the cables allows outside air to come in during the defrost cycle. So 2 cables go to the heat/defrost lever and one to the temperature control.
There's some information on the links above but you can figure what each lever does before you install