- Direct fit for 1989-1993 Dodge Ram with 5.9L Cummins
- Higher activation temperature restricts coolant circulation for a longer time, providing quicker engine warmup
- Ideal for cold climates
- Includes thermostat and high-quality replacement gasket
- Mishimoto Lifetime Warranty
The 12-valve first-gen Cummins in your Ram is considered one of the best diesel engines ever produced, and for good reason. Fuel efficiency, torque, and simplicity are just a few characteristics that give the Cummins its stellar reputation. We're huge fans of the Cummins engine, which is why we’ve developed a high-temperature thermostat for the 1989-1993 5.9L 12v Cummins. This Mishimoto thermostat activates at a higher temperature (189.5°F) compared to the factory thermostat (180°F). By raising the activation temperature, coolant flows through the system later, promoting quicker engine warmup. The Mishimoto high-temperature thermostat is ideal for vehicles in cold climates, where rapid warmup and quicker in-cabin heat is vital. This thermostat includes a high-quality replacement gasket and our signature Mishimoto Lifetime Warranty.
(1) Mishimoto Thermostat
(1) Thermostat Gasket
Mishimoto Lifetime Warranty
- TECH SPECS
Engine Codes 6BT Chassis Codes D/W Series Fits Dodge D250 I6 (5.9L) 1989-1993
Dodge D350 I6 (5.9L) 1989-1993
Dodge W250 I6 (5.9L) 1989-1993
Dodge W350 I6 (5.9L) 1989-1993
OEM Activation Temp C 82.2°C OEM Activation Temp F 180°F Mishimoto Activation Temp (Fahrenheit) 189.5°F Mishimoto Activation Temp (Celsius) 87.5°C
Mishimoto Automotive (“Mishimoto”) warrants its products under this lifetime limited warranty policy (“Warranty Policy”). This Warranty Policy applies solely to: (i) Mishimoto Products purchased directly from Mishimoto or Mishimoto authorized dealers (each a “Mishimoto Product” and collectively, the “Mishimoto Products”) and (ii) the original purchaser of such Mishimoto Product (“Purchaser”). This Warranty Policy is non-transferable and all claims under this Warranty Policy must be accompanied by the original sales receipt. The terms and conditions of this Warranty Policy are subject to change by Mishimoto at any time without notice.
For our complete warranty policy, please click here.
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