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What do the fan and heat nobs control on dash of a 71 bug?

Fan knob: Controls the speed of the fan that blows air into the cabin.

_Position 1_: Off

_Position 2/3_: Low/High fan speed for fresh air from outside

_Position 4_: Low/High fan speed for air circulated inside car

Heat knob: Controls the amount of heat that is mixed with the air blown into the cabin. To allow hot air from heater or cold/fresh air from outside.