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Mishimoto 89-93 Dodge 5.9L Cummins 79C High-Temperature Thermostat

SKU: MISMMTS-RAM-89L

Thermostats, Mechanical

MM Thermostats...

Mishimoto 89-93 Dodge 5.9L Cummins 79C High-Temperature Thermostat

SKU: MISMMTS-RAM-89L

Thermostats, Mechanical

MM Thermostats...

A$133.91
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.
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Description

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 low-temperature thermostat for the 1989-1993 5.9L 12v Cummins. This Mishimoto thermostat activates at a lower temperature (174.2F) compared to the factory thermostat (180F). By lowering the activation temperature, coolant flows through the radiator earlier, maintaining lower fluid temperatures. The Mishimoto low-temperature thermostat is ideal for vehicles in warmer climates, or for use in vehicles experiencing extreme driving/towing conditions. This thermostat includes a high-quality replacement gasket and our signature Mishimoto Lifetime Warranty.

Product Overview

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 low-temperature thermostat for the 1989-1993 5.9L 12v Cummins. This Mishimoto thermostat activates at a lower temperature (174.2°F) compared to the factory thermostat (180°F). By lowering the activation temperature, coolant flows through the radiator earlier, maintaining lower fluid temperatures. The Mishimoto low-temperature thermostat is ideal for vehicles in warmer climates, or for use in vehicles experiencing extreme driving/towing conditions. This thermostat includes a high-quality replacement gasket and our signature Mishimoto Lifetime Warranty.


Features and Benefits

  • Lower activation temperature allows coolant to flow through the system earlier, maintaining lower coolant temperatures
  • Ideal for vehicles in warm climates or under extreme driving/towing conditions
  • Includes thermostat and high-quality replacement gasket

Product Details

Description:Mishimoto 89-93 Dodge 5.9L Cummins 79C High-Temperature Thermostat
Install Difficulty:2
Part Number:misMMTS-RAM-89L
Prop 65 - Short Label:WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov
Prop 65 Y/N:Y
SellingPoint01:Direct fit for 1989-1993 Dodge Ram with 5.9L Cummins
SellingPoint02:Lower activation temperature allows coolant to flow through the system earlier, maintaining lower coolant temperatures
SellingPoint03:Ideal for vehicles in warm climates or under extreme driving/towing conditions
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):174.2
TechSpec Note:N/A
TechSpec OEM Activation Temperature (F):180

Part Type

Engine Coolant Thermostat

Data: v4.2 - Upd: 2026-10-13 18:11:14

Features

  • Ideal for vehicles in warm climates or under extreme driving/towing conditions
  • Includes thermostat and high-quality replacement gasket
  • Lower activation temperature allows coolant to flow through the system earlier, maintaining lower coolant temperatures

Specifications

Product Attributes - Brand
Mishimoto
Product Attributes - Manufacturer's Part Number
MMTS-RAM-89L
Product Attributes - Part Type
Thermostats, Mechanical
Product Attributes - Product Line
Mishimoto Low Temperature Racing Thermostats
Product Attributes - UPC
840197702239
Product Attributes - Opening Temperature Rating (degrees F)
174 degrees F
Product Attributes - Thermostat Flow Rate
Standard-flow
Product Attributes - Gaskets Included
Yes
Product Attributes - Thermostat Material
Copper/Stainless steel
Product Attributes - Quantity
Sold individually.

Reference Information

Brand Name/s Mishimoto
StreetFX SKU misMMTS-RAM-89L
SFX Item ID 4050545
Supplier Item Code 4050545
Manufacturer SKU MMTS-RAM-89L
Manufacturer UPC 840197702239
Alternative References MIMMMTS-RAM-89L, MIO-MMTS-RAM-89L, 5.9L, 79C

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