LLANNDER Aluminum Thermostat Housing: A Perfect OEM Replacement for GM 3.6L Engines

We recently got our hands on the LLANNDER Aluminum Engine Coolant Thermostat Housing Assembly, and we’re impressed with its quality and compatibility. Designed specifically for 2017-2023 GM vehicles equipped with the 3.6L engine, including the Buick LaCrosse, Cadillac XT5, Chevy Blazer, and GMC Acadia, this housing is a perfect match for OEM part #12678780.

What caught our attention was the durable aluminum construction, which offers better heat dissipation than plastic alternatives. The assembly comes complete with all necessary gaskets and seals, making installation straightforward. In our testing, we found it fits precisely like the factory component, with no modifications needed.

For owners of these GM vehicles experiencing coolant leaks or overheating issues, we believe this LLANNDER housing provides an excellent solution at a more reasonable price point than dealership parts.