GM GENUINE PARTS Engine Coolant Thermostat & Housing Assembly — OE Fit, Direct Replacement (15-11076 / 12689041)

GM Genuine Parts 15-11076 (12689041) is an original-equipment engine coolant thermostat and housing assembly designed to restore correct coolant flow and sealing in compatible GM vehicles.

This thermostat and housing assembly replaces the factory unit that secures the thermostat, connects to the radiator hose, and can include ports for temperature sensors or switches. Manufactured to GM OE specifications, it matches the original component’s dimensions, materials, and functional performance so installation fits like the part it replaces. Choosing an OE housing helps avoid leaks, poor thermostat operation, and improper sensor fitment that can arise from ill-fitting aftermarket parts.

How does this assembly affect engine temperature control?

The thermostat regulates coolant circulation by opening and closing at a predetermined temperature; the housing holds it securely and routes coolant to the radiator. Using a correctly sized OE assembly ensures the thermostat responds properly and coolant flows without leaks or bypassing, which keeps engine operating temperature within the intended range.

• Prevents coolant bypass or unintended leaks that change temperature control
• Maintains correct thermostat seating and actuation timing
• Provides proper ports for temperature sensors to deliver accurate readings

Will this part fit my GM vehicle and how accurate is the fit?

GM Genuine Parts are manufactured to the original equipment specifications for form, fit, and function, so this assembly fits the GM models listed for the 15-11076 / 12689041 reference. Always verify part numbers against your vehicle’s VIN or consult a GM parts catalog to confirm compatibility before purchase.

• Produced to GM OE dimensions for a direct replacement
• Designed to accept the same sensors and hoses as the factory unit
• Reduces the need for modification or additional adapters during installation

What are the advantages of choosing an OE thermostat housing over aftermarket alternatives?

An OE assembly offers consistent material quality and precise tolerances that reduce the risk of early failure. It’s built to the same standards as the original part on your vehicle, which helps preserve cooling system integrity and avoids compatibility problems with mating components.

• Matched to GM specifications to minimize rework or adjustments
• Durable construction intended to meet OEM service life expectations
• Compatible with original sensors and mounting hardware for simpler installation

How should I approach installation and maintenance of this part?

Installation typically involves draining the coolant, removing the old housing and thermostat, fitting the new assembly with correct gasket or sealant, and refilling the cooling system. Follow torque specs, replace any worn hoses or clamps, and bleed air from the system per vehicle procedures to ensure reliable operation.

• Replace gasket or O-ring with the new part’s recommended seal
• Use specified torque on bolts to avoid cracking or leaks
• Refill and properly bleed coolant to prevent air pockets and overheating

Who is this for: The GM Genuine Parts 15-11076 (12689041) thermostat and housing assembly is intended for owners, technicians, and fleet managers who need a direct replacement for a factory thermostat housing on compatible GM vehicles. It suits anyone prioritizing OE fit and reliability—DIY mechanics who want a straightforward swap, shops that require parts meeting GM standards, and vehicle owners addressing coolant leaks, failed thermostats, or sensor replacement. Verify vehicle fitment with your VIN or parts guide before ordering to ensure correct application.

Features:

• Repairs leaking thermostat housings
• GM-recommended replacement part for your GM vehicle's original factory component
• Offering the quality, reliability, and durability of GM OE
• Manufactured to GM OE specification for fit, form, and function