OEM 2007 Buick LaCrosse Thermostat

2007 Buick LaCrosse Thermostat Parts and Q&A

• Q: How to replace the thermostat (LY7) on 2007 Buick LaCrosse?

  A: Start the Thermostat (LY7) replacement by partially draining the cooling system without separating upper and lower intake manifolds. First disconnect both the upper and lower intake manifolds before separating the surge tank hose from the Thermostat location. The replacement of the Thermostat (LY7) starts with removing the coolant pipe/Thermostat housing bolt, then the coolant pipe bolt followed by separating the coolant inlet pipe from the Thermostat housing. Remove the coolant pipe o-ring seal and Thermostat seal when performing the Thermostat bolt removal and Thermostat removal process. Before installing the Thermostat place it with a new Thermostat seal then use a torque wrench to tighten the bolts to 10 n.m (89 lb in). Installation of the new coolant pipe seal follows after it is reattached with the fasteners 1 & 3 before reconnecting the surge tank hose to the Thermostat and lastly reinstalling upper and lower intake manifolds to complete the cooling system's refill.