CUMMINS 3928499 OEM 180 DEGREE COOLANT THERMOSTAT – RAM 5.9L 12V (1994–1998)

Product Description

The Cummins 3928499 OEM 180 Degree Coolant Thermostat is the factory-correct temperature control valve used on 1994–1998 Dodge Ram 2500/3500 trucks with the 5.9L 12-Valve Cummins. This genuine Cummins thermostat opens at 180°F, maintaining proper coolant flow, preventing overheating, and ensuring optimal operating temperature for fuel efficiency and durability. Unlike aftermarket thermostats that often open inconsistently, this OE design delivers precise thermal regulation and long-term reliability.

If your 12-valve truck is experiencing overheating, poor cabin heat, extended warm-up times, or fluctuating coolant temperatures, replacing the thermostat with a genuine Cummins 3928499 restores correct cooling system function and long-term dependability.

Fitment

• 1994–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins (6BT)
• B-Series 5.9L engines using a 180°F thermostat with OEM housing

Cross-Reference (Cummins-Only)

Related Cummins 12-valve cooling & service parts:
• Cummins 3903924 OEM Timing Pin – 12-Valve
• Cummins 3900267 Tappet Cover Bolt Grommet Seal
• Cummins 3909395 Spring Hose Clamp – Dipstick

FAQ

What temperature does this Cummins 3928499 thermostat open at?

This thermostat opens at 180 degrees Fahrenheit, the correct OEM temperature for 1994–1998 12-valve 5.9L Cummins trucks.

Will this thermostat fit earlier 1989–1993 Cummins engines?

This specific part is listed for 1994–1998. Some earlier housings differ, so confirm compatibility before ordering.

Should I replace the thermostat housing gasket when installing this?

Yes. Always replace the gasket to ensure a proper seal and prevent coolant leaks.

Is this thermostat better than aftermarket alternatives?

Yes — OEM Cummins thermostats have precise opening temperatures and superior durability compared to many aftermarket versions.

Specifications for cummins 3928499