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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Had my damper replaced 22 days ago. Now the refrigerator side doesn't feel as cold. The guy came back,saw frost in the freezer side and said I need a new defrost thermostat. There's a crack in the freezer. Could that cause the refrigerator to have warmed up and caused the frost in the freezer side? Thanks.
The crack in the freezer liner would not cause that type of issue. If the refrigerator is not cooling properly and there is heavy frost build up on everything in the freezer then either the damper is not opening or the return air duct that goes from the freezer to the refrigerator is blocked up. If there is just frost on the back wall of the freezer compartment lower half then the defrost thermostat could definitely be the issue.
How can test to know if the damper assembly is bad?
Answer Hello MindyK. Turn off the unit and see if the damper closes. If already closed and the unit is off, turn it on and it should cycle. If not, and there is power to it, the damper is bad. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html
Is it possible to get just the damper control motor? It's the only thing that's bad.
Unfortunately the manufacturer made a design change for your model in which the damper assembly cannot be gotten as a separate part any longer. You would need to get the control box kit 5304482075.
Freezer cold....refrigerator sometimes freezes and at other times gets warm. If I turn the thermostat to zero, the damper will closed. If i turn it up to full cold setting nothing...unless I rap on the damper, then it will open.
If the damper is the problem, what is the part number I need? thanks
The damper would most likely be the cause for the unit not operating properly. It sounds like the damper is getting intermittent operation and you would need to replace the control box which has both thermostats, defrost control and damper. The part number for the control box is part number 5304482075 and is the only way to get the damper for your unit.