Q: Heater won't change to defrost on 2003 Dodge Ram 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I can hear something rattling inside the heater, the motor
for the heater to change from floor to defrost to upper vents works, but nothing changes . How do I get to the inside of the heater to find out what is wrong?
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