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The 3.5L engine of the 2008 Toyota Highlander features a straightforward drive belt layout that you should be familiar with should the belt need to be replaced. This vehicle commonly experiences issues with the serpentine belt, so it's likely something you'll have to address during its lifespan. The belt circuits around the AC compressor, crankshaft, water pump, and alternator, passing through the tensioner and pulley. While there isn't an official diagram available from the manufacturer, you can refer to a photo at the end of this response for a visual guide. Please excuse any rudimentary drawings in the image, as they have been confirmed to be accurate. [Image link: http://i802.photobucket.com/albums/yy306/sweeneyp/Toyota%20Nation%20Re-uploads/Serpentine%20Belt%20DIY/IMG_6071_zps2233ccba.jpg]