A-Premium Thermostat Housing Assembly for GM 8-Cyl 4.3L/5.3L/6.2L — OE Fit, Corrosion-Resistant

A-Premium Engine Coolant Thermostat Housing Assembly is a direct-fit replacement designed for GM 8-cylinder 4.3L, 5.3L and 6.2L engines to restore proper coolant routing and reliable thermostat operation.

This thermostat housing assembly from A-Premium replaces worn or leaking housings on a range of Chevrolet, GMC and Cadillac models. Built to match OE mounting points and coolant passages, the unit accepts the factory thermostat and seals using the original-style flange. It’s intended for owners and technicians who need a dependable replacement that restores correct engine warm-up behavior and coolant circulation without custom modifications.

Which vehicles and engines will this housing fit?

The assembly fits many GM trucks, SUVs and performance models produced in the mid-2010s and later. Confirm engine displacement and year before ordering to ensure compatibility.

• Chevrolet: Corvette 2014 (6.2L); Silverado 1500 (2014–2018: 4.3L/5.3L/6.2L; 2019 LD: 5.3L); Suburban (2015–2020); Tahoe (2014–2020).
• GMC: Sierra 1500 (2014–2018: 4.3L/5.3L/6.2L; 2019 Limited: 5.3L); Yukon (2014–2020: 5.3L); Yukon XL (2015–2020: 5.3L/6.2L).
• Cadillac: Escalade & Escalade ESV (2015–2020: 6.2L).

What are the key dimensions, thermostat spec, and mounting details?

This housing includes measured flange and mounting information so installers can quickly verify fit against the vehicle. The thermostat opening and bolt pattern mirror factory geometry for straightforward replacement.

• Bolt hole center-to-center examples: 3.00 in, 2.8 in and 2.8 in (three mounting points).
• Flange dimensions: length 3.33 in; width 3.39 in; thickness 0.40 in.
• Inside coolant bore diameter: 1.06 in; thermostat opening rated at approximately 207°F.

What materials and benefits does the A-Premium unit offer?

A-Premium builds this housing using materials and processes intended to resist corrosion and stand up to engine bay conditions. The construction emphasizes a stable seal surface and durable mounting boss areas to reduce the chance of leaks and premature failure.

• Corrosion-resistant construction to help withstand coolant chemistry and heat cycles.
• Durable flange and mounting areas to maintain reliable sealing over time.
• Designed for stable coolant flow and repeatable thermostat operation.

What’s included, and how does A-Premium back the product?

The package supplies the thermostat housing assembly sized for the listed GM engines; check whether your vehicle requires additional gaskets or sensors. A-Premium supports the part with a one-year, unlimited-mileage warranty to protect against defects.

• Package contents reference: three mounting holes, flange dimensions, and inside diameter details for installer reference.
• Reference numbers associated with fitment: 902-2090, 12674639, 12666569, 1511125 (use to cross-check application).
• A-Premium one-year unlimited-mileage guarantee covers manufacturing defects.

Who is this for: This thermostat housing assembly is aimed at DIY mechanics, independent repair shops, and fleet maintenance teams who need a reliable, direct-fit replacement for GM 4.3L, 5.3L and 6.2L V8 engines. If your vehicle shows coolant leaks at the housing, has thermostat-related warm-up problems, or you’re rebuilding the cooling system, this A-Premium housing offers a practical, OEM-aligned solution backed by a one-year warranty.