Introduction
If your Chromebook is overheating, it may be a good idea to replace the fan.
Tools
Parts
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            Turn the Chromebook onto its backside and unscrew the the following Phillips #1 screws: 
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            Sixteen 5mm Phillips screws located around the border. 
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            Two 5mm Phillips screws located in center. 
 
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            Remove the back cover by carefully prying each side with an iFixit Opening Tool. 
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            Set aside back cover. 
 
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            Unscrew the following Phillips #1 screws: 
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            Two black 4mm Phillips screws located on the fan. 
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            Four copper 4mm Phillips screws located on the heat sink. 
 
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            Disconnect the fan from the motherboard by pulling down on the wire connector with two iFixit Opening Tools. 
 
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            Lift up the fan while unwrapping the black and white wires from around the fan. 
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            Remove the fan. 
 
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To reassemble your device, follow these instructions in reverse order.