MAHLE Thermostat Housing Gasket 06-16 GM 6.6L Duramax LLY/LBZ/LMM/LML

Is it time to replace a worn thermostat housing gasket to stop coolant leaks? The MAHLE Thermostat Housing Gasket is a direct-fit OE replacement that seals the thermostat housing and prevents coolant from escaping where the housing meets the engine. This small but critical gasket helps maintain proper coolant circulation and system pressure, ensuring the engine reaches and maintains the correct operating temperature. Replacing a damaged or brittle gasket during thermostat service helps prevent coolant leaks that can lead to overheating or reduced cooling system efficiency. Manufactured to meet or exceed original equipment specifications, the MAHLE C31889 uses durable silicone sealing material engineered to withstand constant exposure to engine heat, coolant chemicals, and pressure cycles. Its precision-cut design ensures a consistent seal around the thermostat housing while maintaining flexibility during thermal expansion and contraction. Built for dependable OE-level fitment and durability.