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In a 2007 Buick Terraza, the thermostat can be found under the hood on the right side near the engine. To access it, you'll need to locate and remove the air duct by unbolting it. Once the air duct is removed, you'll see the thermostat housing with a black pipe attached. A new thermostat will run you between $20 and $40, depending on whether you opt for a generic or an authentic OEM part.
The thermostat for the 2007 Buick Terraza can be found along the bottom coolant hose leading to the radiator.