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

SKU: MISMMTS-RAM-99L

Thermostats, Mechanical

MM Thermostats

Mishimoto

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

SKU: MISMMTS-RAM-99L

Thermostats, Mechanical

MM Thermostats

IN STOCK! Est Ship 3-5 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.

We accept

Description

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.

Product Overview

1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 42RE, 2003 Dodge Ram 1500 Laramie 5.9 Liter 45RFE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 2003 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter 45RFE, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter 46RE, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter NV3500, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter NV4500, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter 42RE, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter 46RE, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter NV3500, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter NV4500, 1999-2001 Dodge Ram 1500 ST 5.9 Liter 42RE, 2002-2003 Dodge Ram 1500 ST 5.9 Liter 45RFE, 1999-2003 Dodge Ram 1500 ST 5.9 Liter 46RE, 1999-2003 Dodge Ram 1500 ST 5.9 Liter NV3500, 1999-2003 Dodge Ram 1500 ST 5.9 Liter NV4500, 2003 Dodge Ram 2500 5.9 Liter 45RFE, 1999-2003 Dodge Ram 2500 5.9 Liter 46RE, 1999-2003 Dodge Ram 2500 5.9 Liter 47RE, 2003-2009 Dodge Ram 2500 5.9 Liter 48RE, 1999-2005 Dodge Ram 2500 5.9 Liter NV4500, 1999-2004 Dodge Ram 2500 5.9 Liter NV4500HD, 1999-2005 Dodge Ram 2500 5.9 Liter NV5600, 1999-2002 Dodge Ram 2500 Base 5.9 Liter 46RE, 1999-2002 Dodge Ram 2500 Base 5.9 Liter 46RE, 1999-2002 Dodge Ram 2500 Base 5.9 Liter 47RE, 1999-2002 Dodge Ram 2500 Base 5.9 Liter 47RE, 1999-2002 Dodge Ram 2500 Base 5.9 Liter NV4500, 1999-2002 Dodge Ram 2500 Base 5.9 Liter NV4500, 1999-2002 Dodge Ram 2500 Base 5.9 Liter NV4500HD, 1999-2002 Dodge Ram 2500 Base 5.9 Liter NV4500HD, 1999-2002 Dodge Ram 2500 Base 5.9 Liter NV5600, 1999-2002 Dodge Ram 2500 Base 5.9 Liter NV5600, 2005-2007 Dodge Ram 2500 Laramie 5.9 Liter 48RE, 2005-2007 Dodge Ram 2500 Laramie 5.9 Liter 545RFE, 2007 Dodge Ram 2500 Laramie 5.9 Liter 68RFE, 2005-2007 Dodge Ram 2500 Laramie 5.9 Liter G56 ...See Application Guide for Additional Fitments

Features and Benefits

Activates at lower temperature so coolant flows through system earlier
Allows for cooler engine temperatures
Ideal for warm climates

Product Details

Year	Make
Alternate Part Number:	MMTS-RAM-99L
Color:	Silver
Description:	Dodge 5.9L/6.7L Cummins Low-Temperature Thermostat
Finish:	Raw
Install Difficulty:	N/A
Installation Difficulty:	2/5
Material:	Aluminum
Part Number:	misMMTS-RAM-99L
Prop 65 - Short Label:	WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov
Prop 65 Y/N:	Y
SellingPoint01:	Direct fit for 1999-2013 Dodge Ram with 5.9L/6.7L Cummins
SellingPoint02:	Activates at lower temperature so coolant flows through system earlier
SellingPoint03:	Allows for cooler engine temperatures
SellingPoint04:	Ideal for warm climates
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:	1999-2007 Dodge Ram 2500 w/ 5.9L Cummins Engine--1999-2007 Dodge Ram 3500 w/ 5.9L Cummins Engine--2007.5-2013 Dodge Ram 2500 w/ 6.7L Cummins Engine--2007.5-2013 Dodge Ram 3500 w/ 6.7L Cummins Engine
TechSpec Chassis Codes:	N/A
TechSpec Engine Codes:	N/A
TechSpec Includes:	(1) Mishimoto Thermostat--(1) O-ring--Mishimoto Lifetime Warranty
TechSpec Mishimoto Activation Temperature (F):	180
TechSpec Note:	N/A
TechSpec OEM Activation Temperature (F):	190

Application Summary

Part Type

Engine Coolant Thermostat

Data: v4.2 - Upd: 2026-10-11 23:03:24

Features

Activates at lower temperature so coolant flows through system earlier
Allows for cooler engine temperatures
Ideal for warm climates

Specifications

Product Attributes - Brand: Mishimoto
Product Attributes - Manufacturer's Part Number: MMTS-RAM-99L
Product Attributes - Part Type: Thermostats, Mechanical
Product Attributes - Product Line: Mishimoto Thermostats
Product Attributes - UPC: 748354013146
Product Attributes - Opening Temperature Rating (degrees F): 180 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.
Product Attributes - Notes: Factory-style O-ring.

Reference Information

Brand Name/s	Mishimoto
StreetFX SKU	misMMTS-RAM-99L
SFX Item ID	4050250
Supplier Item Code	4050250
Manufacturer SKU	MMTS-RAM-99L
Manufacturer UPC	748354013146
Alternative References	mio-mmts-ram-99l, MIMMMTS-RAM-99L, 5.9L/6.7L