Refrigerator with ice maker in French door section; inconsistent in temp control. Old damper module was heard cycling repeatedly then seized up. Freezer section frosted over when door was left ajar after top refrigerator had issues. New damper module arrived in two days & was installed, but still no air flow. Module was found in OPEN position, fan was running. ShopVac in suck config pulled no cold air from freezer section thru cold air transfer tube. ShopVac in BLOW config then applied to cold air transfer tube from freezer section until air felt at freezer, tube finally clear. Retested, air flow felt at refrigerator damper port. Normal operation after that point.