The thermostat is located in the water jacket near the output side of the radiator on most cars. The Buick V6 and V8 engines use a housing on the top front of the motor that directs coolant from the motor to the radiator through a rubber hose. The thermostat sits inside the housing and opens when the coolant reaches a preset temperature.. The person in the car watched the temp gauge- (remember the thermostat is in the CLOSED position- and the block is almost empty of fluid). Once we saw the temp start going past the 210 mark- we shut off engine. Gave the thermostat a chance to open-and allow coolant to somewhat flow. We repeated this several time- revving the engine up to 2000.
Join my channel for access to one on one question and answers in Discord with a 27 year Master Mechanic. https://www.youtube.com/channel/UCnnn_nrQARTFk69MM.. Shop for the best Thermostat Housing/Water Outlet for your 2014 Buick Enclave, and you can place your order online and pick up for free at your local O'Reilly Auto Parts.