The vacuum system on the 2008 Toyota Sienna is an integral part of the functionality of the vehicle. Therefore, it's important to understand how it works, and a diagram can be convenient if You need to make any repairs or replacements. Luckily, Toyota has the following diagram to assist You with any diagnostics -- https://parts.Toyota.com/images/parts/ToyotaOEM/fullsize/a1_173570D.jpg .
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