Duramax OE Rear Thermostat GM 97241130 | 6.6L Duramax (LB7 LLY LBZ LMM LML)

Restore factory cooling performance in your GM 6.6L Duramax with this genuine OEM rear thermostat. The GM 97241130 (ACDelco 131-131) is the exact factory replacement part for the rear thermostat position on Duramax-equipped trucks and vans.

Engineered to the original 180°F opening temperature, this thermostat helps your engine reach and maintain proper operating temperature for optimal efficiency, power delivery, and long-term reliability. It is a direct drop-in replacement—no modifications required.

Key Features:

• Genuine GM / ACDelco OEM part (97241130 / 131-131)
• Factory 180°F (82°C) activation temperature
• Includes gasket/seal for a complete installation
• Offset design with built-in bleeder valves (identifies this as the rear thermostat, located toward the firewall)
• Precision-engineered for reliable operation and extended service life
• Controls coolant flow to help prevent overheating and maintain consistent engine temperature

Why Choose Genuine OE? Aftermarket thermostats can vary in opening temperature and durability. This OEM unit guarantees the same fit, form, and function as the part that came on your truck from the factory, giving you peace of mind and consistent cooling system performance.

Vehicle Fitment Fits a wide range of GM 6.6L Duramax applications, including:

• 2001–2016 Chevrolet Silverado 2500HD / 3500HD
• 2001–2016 GMC Sierra 2500HD / 3500HD
• 2003-2016 Chevrolet Express / GMC Savana vans with 6.6L Duramax

Engines: LB7, LLY, LBZ, LMM, and LML (rear position). Note: This is the rear thermostat only (toward the firewall). Many customers replace both the front (GM 97241129) and rear thermostats at the same time, along with the thermostat housing gaskets (GM 97223686), during cooling system service.

Specifications

• Part Number: GM 97241130
• ACDelco Equivalent: 131-131
• Opening Temperature: 180°F (82°C)
• Type: Conventional thermostat with jiggle pin/weep hole
• Includes: Thermostat + gasket
• Position: Rear (firewall side)

Keep your Duramax running at the proper temperature with this high-quality OEM replacement. Order yours today for a reliable, factory-correct cooling system repair.