Very noisy during cooling cycle

Unplug unit. Remove all frozen food and shelves from lower Freezer section (stored in top section). Using 1/4" nut driver, remove Ice Maker and Rear Panel from freezer section. Need to squeeze tabs of wire connector to unplug ice maker and remove water line that is routed through back panel (may need small screw driver to line up plug ends). Remove existing fan assembly with nut driver, taking care to mark electrical wire connections (4 plug-ins). Install new fan assembly and connect wiring. Wiring for ice maker is also routed and zip tied to this motor assembly. Replace ice maker connector and water line in special cut-outs of back panel and reinstall back panel. Reinstall ice maker. Plug refigerator back in. Takes 5 to 10 minutes for unit to begin running cooling cycle.