Introduction
This guide will help you replace the heat sink in a Dell Inspiron 1305.
Tools
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            Slide the battery release switch away from the lock symbol until you hear the battery click. 
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            Slide the battery towards the back of the laptop until it comes free. 
 
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            Remove/loosen the eight 4.8mm screws with a #1 Phillips screwdriver securing the bottom panel. 
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            Remove the bottom panel. 
 
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            Loosen the five 5.5mm screws with a #1 Phillips screwdriver securing the heat sink and clean it with compressed air 
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            Gently lift the heat sink from the side, as indicated in the picture. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.