Mishimoto MMTS-RAM-99L Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat
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A defective thermostat can result in engine overheating and potential internal damage. Improve the reliability of your 5.9L/6.7L cooling system with a Mishimoto Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat! This thermostat is designed as a direct-fit replacement for your aged factory unit. The Mishimoto thermostat has a lower activation temperature (180 degrees Fahrenheit) compared to the factory thermostat (190 degrees Fahrenheit for 99-10 and 2013 trucks and 200 degrees Fahrenheit for 10-12 trucks). The lower activation temperature allows coolant to flow through the engine earlier, which reduces and maintains lower engine temperatures. This thermostat is ideal for use in warmer climates or under extreme towing/driving conditions. As with all our products, this thermostat includes the Mishimoto Lifetime Warranty, ensuring superior product quality and craftsmanship.Key FeaturesDirect fit for 1999-2013 Dodge Ram with 5.9L/6.7L CumminsActivates at lower temperature so coolant flows through system earlierAllows for cooler engine temperaturesIdeal for warm climatesMishimoto Lifetime WarrantyPurchase Includes(1) Mishimoto Thermostat(1) O-ringMishimoto Lifetime WarrantySpecificationsApplications1999-2007 Dodge Ram 2500 w/ 5.9L Cummins Engine1999-2007 Dodge Ram 3500 w/ 5.9L Cummins Engine2007.5-2013 Dodge Ram 2500 w/ 6.7L Cummins Engine2007.5-2013 Dodge Ram 3500 w/ 6.7L Cummins EngineMishimoto Activation Temperature (F)180OEM Activation Temperature (F)190
A defective thermostat can result in engine overheating and potential internal damage. Improve the reliability of your 5.9L/6.7L cooling system with a Mishimoto Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat! This thermostat is designed as a direct-fit replacement for your aged factory unit. The Mishimoto thermostat has a lower activation temperature (180 degrees Fahrenheit) compared to the factory thermostat (190 degrees Fahrenheit for 99-10 and 2013 trucks and 200 degrees Fahrenheit for 10-12 trucks). The lower activation temperature allows coolant to flow through the engine earlier, which reduces and maintains lower engine temperatures. This thermostat is ideal for use in warmer climates or under extreme towing/driving conditions. As with all our products, this thermostat includes the Mishimoto Lifetime Warranty, ensuring superior product quality and craftsmanship.Key FeaturesDirect fit for 1999-2013 Dodge Ram with 5.9L/6.7L CumminsActivates at lower temperature so coolant flows through system earlierAllows for cooler engine temperaturesIdeal for warm climatesMishimoto Lifetime WarrantyPurchase Includes(1) Mishimoto Thermostat(1) O-ringMishimoto Lifetime WarrantySpecificationsApplications1999-2007 Dodge Ram 2500 w/ 5.9L Cummins Engine1999-2007 Dodge Ram 3500 w/ 5.9L Cummins Engine2007.5-2013 Dodge Ram 2500 w/ 6.7L Cummins Engine2007.5-2013 Dodge Ram 3500 w/ 6.7L Cummins EngineMishimoto Activation Temperature (F)180OEM Activation Temperature (F)190
HSP offers a limited lifetime warranty to the original purchaser on eligible HSP products. Underhood powder coating has separate two-year limited coverage. Non-HSP brands follow their own manufacturer warranties. Discontinued products and customer/installer damage are excluded. Claim authorization is required; customer pays inbound shipping for ordinary claims.
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
HSP Diesel warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
- Return eligibility
- HSP states returns must be postmarked within 30 days of purchase, new and unused with original tags and packaging, with an approved RMA. A 15% restocking fee and customer-paid return shipping apply. Special orders, non-HSP dropship products, apparel, used items and custom colors are excluded. Based on what HSP Diesel offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- HSP Diesel
- Warranty duration
- Product-specific duration not stated; see supplier terms
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–10 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- HSP Diesel
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.