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Guide to Replacing the Thermostat on the Toyota Sienna 3.5

Model: Toyota Sienna Xl30 - Years 2010-2020
Part: Thermostat

The instructions in this guide will show you how to remove and replace the thermostat on the Toyota Sienna 3.5. First, open the vehicle's bonnet and begin to remove the engine mount by unscrewing the bolts; then disconnect the thermostat pipes, draining the fluid into a container for about ten minutes, as shown in the video. At this point, unscrew the thermostat bolts, remove it, and replace it with the new original part; reconnect it and finally top up the coolant, filling the reservoir to the maximum level mark.

Posted on 30 April 2026 by ScegliAuto

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