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If you decide to replace your fan, use Apple part number 661-4946. This fan works in Macbook & Macbook Pro - A1278 - MacBook (13-inch Aluminum Late 2008), MacBook Pro (13-inch Mid 2009). Do a web search and buy a new one as the used ones may already have a lot of wear and are subject to failure faster. Using another fan may involve changing the plug to the logic board. If the fan is screeching, replace it. If it's just making a little noise, lift the sticker and place a drop of high quality oil in the center.