Description
Maintain proper engine operating temperature with this Genuine GM Thermostat Kit, designed for 2017–2026 Silverado/Sierra HD L5P and 2019–2024 4500HD/5500HD L5D Duramax diesel engines.
Modern diesel emissions systems rely heavily on precise temperature control. If engine temperature is too low, DPF regeneration may be disabled, leading to reduced performance, warning lights, and potential emissions system issues. Replacing worn or sticking thermostats ensures your engine reaches proper operating temperature quickly and maintains it consistently.
This kit includes both factory-spec thermostats and OEM sealing gaskets for a complete, reliable service solution.
Kit Includes:
(1) GM 131-197 / 12680456 Thermostat — 85°C / 185°F
(1) GM 131-198 / 12680457 Thermostat — 82°C / 180°F
(2) GM 12680544 Thermostat Gaskets
Features & Benefits:
– Genuine GM OEM components — not aftermarket
– Correct temperature ratings for factory cooling calibration
– Ensures proper warm-up and operating temps
– Helps maintain proper DPF regeneration function
– Prevents over-cooling and poor fuel efficiency
– Restores factory cooling system performance
– Direct-fit installation
Vehicle Fitment:
2017–2026 Chevrolet Silverado 2500HD / 3500HD (6.6L L5P Duramax)
2017–2026 GMC Sierra 2500HD / 3500HD (6.6L L5P Duramax)
2019–2024 Chevrolet / GMC 4500HD / 5500HD (L5D Duramax)
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