Product Description
MOPAR 05086739AB 190 DEGREE COOLANT THERMOSTAT FOR 03-07 DODGE WITH 5.9L CUMMINS ENGINE
Maintain optimal engine operating temperature and cooling system performance with the genuine Mopar 05086739AB 190 Degree Coolant Thermostat for 2003-2007 Dodge Ram trucks equipped with the legendary 5.9L Cummins diesel engine. Engineered to OEM specifications, this factory thermostat ensures precise coolant flow regulation for dependable engine protection, fuel efficiency, and long-term reliability.
The Mopar 05086739AB thermostat is designed to open at 190 degrees Fahrenheit, allowing your Cummins engine to reach and maintain the proper operating temperature under towing, hauling, daily driving, and cold-weather conditions. A failing thermostat can cause overheating, poor heater performance, reduced fuel economy, and inconsistent engine temperatures. Replacing a worn thermostat with a genuine Mopar component helps restore proper cooling system operation and protects critical engine components.
Manufactured for direct-fit installation, this OEM thermostat installs seamlessly into the factory cooling system without modification. Unlike lower-quality aftermarket thermostats, genuine Mopar cooling components are designed for exact opening temperatures, proper sealing, and long-lasting durability under heavy-duty diesel operating conditions.
This thermostat replaces previous Mopar part number 5086739AA and is compatible with both automatic 48RE and manual G56 transmission-equipped Ram trucks.
FAQ
What temperature does this thermostat open at?
This thermostat is calibrated to open at 190 degrees Fahrenheit for proper OEM engine cooling performance.
Is this a genuine Mopar thermostat?
Yes. The 05086739AB is a genuine OEM Mopar cooling system component.
What are the symptoms of a failing thermostat?
Common symptoms include overheating, fluctuating coolant temperatures, poor heater performance, slow warm-up times, and diagnostic trouble codes.
Will this fit all 5.9L Cummins trucks?
This thermostat fits select 2003-2007 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L Cummins diesel engine.
Is installation direct replacement?
Yes. This OEM thermostat is designed for direct replacement installation using factory cooling system components.
Vehicle Fitment
- 2003 Dodge Ram 2500 5.9L Cummins
- 2003 Dodge Ram 3500 5.9L Cummins
- 2004 Dodge Ram 2500 5.9L Cummins
- 2004 Dodge Ram 3500 5.9L Cummins
- 2005 Dodge Ram 2500 5.9L Cummins
- 2005 Dodge Ram 3500 5.9L Cummins
- 2006 Dodge Ram 2500 5.9L Cummins
- 2006 Dodge Ram 3500 5.9L Cummins
- 2007 Dodge Ram 2500 5.9L Cummins
- 2007 Dodge Ram 3500 5.9L Cummins
Fits Select Trims Including:
ST, SLT, Sport, Laramie, TRX4, Mega Cab
Specifications for Mopar 05086739AB
| Category | Details |
|---|---|
| Part Number | 05086739AB |
| Brand | Mopar (OEM) |
| Product Type | 190 Degree Coolant Thermostat |
| Engine Compatibility | 5.9L I6 Cummins 24V Turbo Diesel |
| Vehicle Fitment | 2003-2007 Dodge Ram 2500/3500 5.9L Cummins |
| Opening Temperature | 190 Degrees Fahrenheit |
| Function | Regulates coolant flow to maintain proper engine operating temperature |
| Installation Type | Direct OEM Replacement |
| Transmission Compatibility | 48RE Automatic / G56 Manual |
| Replaces Part Numbers | 5086739AA |
| UPC | Not Available |
| GTIN | Not Available |
| Shipping Weight | Approx. 1 lb |
| Shipping Dimensions | Approx. 6" x 6" x 3" |
| Shipping | Standard ground shipping available |
| Operating Benefits | Maintains proper engine temperature, improves cooling efficiency, reduces overheating risk, supports fuel efficiency and engine longevity |
| Prop 65 | WARNING: Cancer and reproductive harm – www.P65Warnings.ca.gov |
| Condition | New |
