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In the 2007 Buick Rendezvous, the thermostat is situated below the throttle body, making it quite challenging to reach, according to many drivers. Replacing it is even more difficult due to the lower bolt being mostly obstructed by the adjacent exhaust manifold. It's puzzling why Buick designed it this way, but I may never find out the reason. Typically, thermostat replacements are straightforward tasks, provided they are easily accessible. Owners of Rendezvous often opt to have a mechanic handle the replacement due to the intricate process, especially given the aluminum throttle body that could be damaged. If you take this route, expect to pay around $300 for parts and labor.
In the 2007 Buick Rendezvous, you can find the thermostat beneath the housing located near the water pump on the cylinder head.