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 degreesF) compared to the factory thermostat (180 degreesF). 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.
Specifications:
| Description_DEF |
Engine Coolant Thermostat |
| Description_DES |
High-Temperature Thermostat, fits Dodge 5.9L First-Gen Cummins 1989-1993 |
| Description_EXT |
High-Temperature Thermostat, fits Dodge 5.9L First-Gen Cummins 1989-1993 |
| Description_FAB |
Direct fit for 1989-1993 Dodge Ram with 5.9L Cummins |
| Description_FAB |
Higher activation temperature restricts coolant circulation for a longer time, providing quicker engine warmup |
| Description_FAB |
Ideal for cold climates |
| Description_FAB |
Includes thermostat and high-quality replacement gasket |
| Description_FAB |
Mishimoto Lifetime Warranty |
| Description_INV |
Mishimoto MMTS-RAM-89H |
| Description_MKT |
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 degreesF) compared to the factory thermostat (180 degreesF). 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. |
| Description_SHO |
Thermostat |
| Install Difficulty |
2 |
| SellingPoint01 |
Direct fit for 1989-1993 Dodge Ram with 5.9L Cummins |
| SellingPoint02 |
Higher activation temperature restricts coolant circulation for a longer time, providing quicker engine warmup |
| SellingPoint03 |
Ideal for cold climates |
| SellingPoint04 |
Includes thermostat and high-quality replacement gasket |
| SellingPoint05 |
Mishimoto Lifetime Warranty |
| SellingPoint06 |
N/A |
| SellingPoint07 |
N/A |
| SellingPoint08 |
N/A |
| SellingPoint09 |
N/A |
| SellingPoint10 |
N/A |
| SellingPoint11 |
N/A |
| SellingPoint12 |
N/A |
| SellingPoint13 |
N/A |
| SellingPoint14 |
N/A |
| SellingPoint15 |
N/A |
| TechSpec Applications |
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 |
| TechSpec Chassis Codes |
D/W Series |
| TechSpec Engine Codes |
6BT |
| TechSpec Includes |
(1) Mishimoto Thermostat--(1) Thermostat Gasket--Mishimoto Lifetime Warranty |
| TechSpec Mishimoto Activation Temperature (F) |
189.5 |
| TechSpec Note |
N/A |
| TechSpec OEM Activation Temperature (F) |
180 |
| Length |
2.5000 |
| Width |
2.5000 |
| Height |
2.5000 |
| Weight |
1.0000 |
