SKU: MMTS-RAM-94H | UPC: 748354013931
Mishimoto Dodge 5.9L Cummins High-Temperature Thermostat 1994-1998 Ram 2500/3500
The Mishimoto high-temperature thermostat upgrades 1994-1998 Dodge Ram 2500 and 3500 trucks with 5.9L Cummins 12-valve engines. It opens at 221°F compared to stock 195°F to sustain higher coolant temperatures for improved turbocharger response and engine efficiency during performance driving. This direct-fit part prevents overcooling in modified Cummins engines while maintaining reliability.
Key Features
- 221°F Opening Temperature: Raises optimal operating range to enhance combustion efficiency, reduce turbo lag, and support high-boost setups in 5.9L Cummins engines
- CNC-Machined Aluminum Housing: Precision-engineered for strength and corrosion resistance, ensuring long-term durability under extreme diesel operating conditions
- Stainless Steel Bellows and Spring: Provides consistent pressure and sealing for reliable operation across thousands of heat cycles
- Direct OEM Replacement: Bolts into factory location on 1994-1998 Ram 5.9L Cummins with no modifications required
- Includes Gasket and Bolts: Complete kit simplifies installation and prevents coolant leaks
Product Notes
- Ideal for stock or tuned 12-valve Cummins engines seeking better thermal management
- Pair with upgraded radiator or intercooler for maximum cooling system performance
- Packaged weight 0.75 lbs, box dimensions 4 x 4 x 3 inches
Installation Notes
- Professional installation recommended.
- Drain coolant from radiator and block before removal to avoid spills
- Torque mounting bolts to 106 in-lbs. compatible with factory water outlet housing
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1994-1998 | Dodge | Ram 2500 | Base |
| 1994-1998 | Dodge | Ram 3500 | Base |
| 1994-1998 | Dodge | Ram 2500 | Laramie |
| 1994-1998 | Dodge | Ram 3500 | Laramie |
| 1997-1998 | Dodge | Ram 2500 | ST |
| 1997-1998 | Dodge | Ram 3500 | ST |
Why Choose Mishimoto?
- Proven leader in cooling components for diesel trucks and performance vehicles
- Direct-fit design tested for real-world Cummins applications
- Lifetime warranty covers defects in materials and workmanship
Frequently Asked Questions
- Q: Will this thermostat fit my 1994-1998 Dodge Ram 2500 5.9L Cummins?
A: Yes, it is a direct replacement for all 12-valve 5.9L Cummins engines in 1994-1998 Ram 2500 and 3500 models, including Base, Laramie, and ST trims - Q: What materials are used in construction?
A: Features CNC-machined aluminum housing with stainless steel bellows, spring, and brass pellet for corrosion resistance and precision operation - Q: What warranty applies and is installation difficult?
A: Backed by Mishimoto Lifetime Warranty. Installation takes 30-60 minutes with basic tools. drain coolant first and follow torque specs
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Secure retail box 4 x 4 x 3 inches
- Weight: 0.75 lbs
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