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Mishimoto Mishimoto Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat
Mishimoto Mishimoto Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat
Mishimoto Mishimoto Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat
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Mishimoto Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat

Mishimoto
MISMMTS-RAM-99L
748354013146
Thermostats
20+ Units In Stock - Ships Next Business Day
$ 92.00 $ 83.95
$ 83.95

SKU: MMTS-RAM-99L | UPC: 748354013146

Mishimoto Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat

Replace your stock thermostat with the Mishimoto low-temperature thermostat designed for Dodge Ram trucks equipped with 5.9L or 6.7L Cummins diesel engines. This direct-fit upgrade fits 1999-2013 Ram 1500, 2500, 3500, 4500, and 5500 models across various submodels. It opens at 160°F to deliver lower operating coolant temperatures, supporting higher performance during towing, racing, or daily driving while enabling faster warmup times.

Key Features

  • Lower Opening Temperature: Activates at 160°F and fully opens at 180°F versus stock 180-203°F range, reducing engine temps by 15-25°F under load for consistent power output
  • Direct OEM Replacement: Exact fit with no modifications required, includes O-ring seal for leak-free installation on 5.9L 24-valve and 6.7L Cummins engines
  • Enhanced Cooling Performance: Maintains optimal coolant flow to radiator and intercooler, preventing heat soak in upgraded turbo or tuning applications
  • Durable Construction: High-quality wax pellet, stainless steel spring, and precision-machined components withstand high-pressure diesel environments
  • Quick Warmup: Faster engine warmup in cold conditions improves fuel efficiency and reduces emissions during startup

Product Notes

  • Pair with upgraded radiator or fan for maximum cooling gains in high-horsepower builds
  • Monitor coolant levels after install to ensure proper function
  • Product weight 0.4 lbs, ships in compact box measuring 3in x 5in x 7in

Installation Notes

  • Professional installation recommended.
  • Drain coolant before removing stock thermostat housing
  • Compatible with factory housing and bolts, torque to OEM specs

This Part Fits

Year Make Model Submodel
1999-2001,2003 Dodge Ram 1500 Laramie
2002-2003 Dodge Ram 1500 SLT
1999-2001 Dodge Ram 1500 Sport
1999-2003 Dodge Ram 1500 ST
1999-2002 Dodge Ram 2500 Base
2003,2005-2010 Dodge Ram 2500 Laramie
2006-2010 Dodge Ram 2500 Power Wagon
2003-2010 Dodge Ram 2500 SLT
2006-2007 Dodge Ram 2500 Sport
2003-2010 Dodge Ram 2500 ST
2008-2010 Dodge Ram 2500 SXT
2010 Dodge Ram 2500 TRX
2006-2007 Dodge Ram 2500 TRX4
1999-2002 Dodge Ram 3500 Base
2003-2010 Dodge Ram 3500 Laramie
2003-2010 Dodge Ram 3500 SLT
2006-2007 Dodge Ram 3500 Sport
2003-2010 Dodge Ram 3500 ST
2008-2010 Dodge Ram 3500 SXT
2007 Dodge Ram 3500 TRX4
2008-2010 Dodge Ram 4500 Laramie
2008-2010 Dodge Ram 4500 SLT
2008-2010 Dodge Ram 4500 ST
2008-2010 Dodge Ram 5500 Laramie
2008-2010 Dodge Ram 5500 SLT
2008-2010 Dodge Ram 5500 ST
2013 Ram 2500 Big Horn
2011-2013 Ram 2500 Laramie
2011-2013 Ram 2500 Laramie Longhorn
2013 Ram 2500 Lone Star
2012-2013 Ram 2500 Outdoorsman
2011-2013 Ram 2500 Power Wagon
2011-2013 Ram 2500 SLT
2011-2013 Ram 2500 ST
2013 Ram 2500 Tradesman

Why Choose Mishimoto?

  • Proven track record in diesel cooling upgrades for Cummins engines
  • Rigorously tested on dyno and track for reliability under extreme conditions
  • Lifetime warranty covers defects in materials and workmanship

Frequently Asked Questions

  • Q: Will this fit my 2005 Dodge Ram 2500 5.9L Cummins?
    A: Yes, it provides direct compatibility for 1999-2010 Dodge Ram 2500/3500 with 5.9L Cummins across Laramie, SLT, ST, and other submodels listed
  • Q: What material is the thermostat made from?
    A: Features a robust wax pellet actuator, stainless steel spring, and engineered brass plate for corrosion resistance and long-term durability in coolant
  • Q: Does installation require special tools or tuning?
    A: No special tools needed beyond basic wrenches. direct bolt-on swap with included O-ring, no ECU changes or tuning required

Shipping & Handling

  • Method: UPS Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Secure Mishimoto retail box, 3in x 5in x 7in
  • Weight: 0.4 lbs

Request For Information

Have questions about Mishimoto Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat? Fill out the form below and we'll get back to you by the next business day.
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