What exactly does this part do?
Answer It is what regulates the flow of air coming out of the freezer compartment into the fresh food compartment.
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How do I know if my damper control is a one switch or two switch type?
You would have to look at the damper and if it has 2 switches then get the 2 switch damper if only one then get the single switch.
Noise coming from I think the Damper Box open up cover fan blades not moving but motor is turning Refigerator side very cold
If the damper is staying open but it sounds like it is operating then the issue will be with the damper control which is part number 241600902.