CUMMINS 5292744 OEM 190° THERMOSTAT – 5.9L ISB (2003–2007)

Product Description

Bring your third-gen back to true factory operating temperature with the CUMMINS 5292744 OEM 190° THERMOSTAT – 5.9L ISB (2003–2007). This genuine Cummins thermostat drops directly into the factory housing on 2003–2007 Ram 2500/3500 5.9L common-rail trucks and restores the precise 190°F calibration your ECM was designed around for warm-up, heater output, towing performance, and long engine life.

A weak or stuck-open thermostat can leave your 5.9L running cold, killing fuel economy and heater performance. The genuine Cummins 5292744 coolant thermostat uses an OE wax element and seat for repeatable opening/closing cycles, so your temperature gauge stays rock-steady even under heavy load, big tune, or hot weather towing.

CUMMINS 5292744 OEM 190 DEGREE THERMOSTAT, GENUINE CUMMINS COOLANT THERMOSTAT, 5.9L ISB 2003 2004 2005 2006 2007 THERMOSTAT, DODGE RAM 2500 3500 5.9L CUMMINS THERMOSTAT, 190 DEGREE CUMMINS THERMOSTAT, CUMMINS 5292742 180 DEGREE ALTERNATIVE, CUMMINS 3954829 THERMOSTAT HOUSING SEAL, THIRD GEN 5.9L CUMMINS COOLING SYSTEM PARTS, OEM CUMMINS ENGINE PARTS CPP DIESEL

Key Features & Benefits

• Genuine Cummins 5292744 190° thermostat – not an aftermarket copy.
• OE temperature calibration for proper warm-up, heater performance, and fan strategy.
• Direct-fit to the factory thermostat housing on 2003–2007 5.9L ISB trucks.
• Durable wax element and seat for long, repeatable opening/closing cycles.
• Helps correct cold running, slow warm-up, or unstable temps from a failed thermostat.

Fitment

This thermostat is engineered for the following applications:

• 2003–2007 Dodge/Ram 2500 5.9L Cummins (24V common-rail ISB)
• 2003–2007 Dodge/Ram 3500 5.9L Cummins (24V common-rail ISB)

Engine: 5.9L ISB common-rail diesel (third-gen).
Location: Engine thermostat housing (front of cylinder head).
Quantity: 1 thermostat per engine.
Always verify with your VIN or engine serial number (ESN) for cab & chassis or non-US builds.

Cross-Reference & ID (Information Only)

• Cummins OEM: 5292744 (this part)
• Cummins ID: 3954830 (catalog cross-reference)
• Mopar service number (dealer): 5086739AB
• Seal used with this thermostat: Cummins 3954829 thermostat housing seal

Cross-reference numbers are provided for identification only. Always verify by ESN and compare the existing thermostat before ordering.

Related Genuine Cummins Cooling Parts

Round out your cooling system refresh with these Cummins components for the same platform:

• 180° alternative thermostat for performance/towing builds:
  CUMMINS 5292742 OEM 180° THERMOSTAT – 5.9L ISB (1998.5–2007) | 4BT
• Thermostat housing seal (O-ring) for a leak-free install:
  CUMMINS 3954829 OEM THERMOSTAT HOUSING SEAL – 5.9L/6.7L
• Vertical water neck for straight-up hose routing and custom builds:
  CUMMINS 3943300 OEM VERTICAL WATER NECK / WATER OUTLET – 5.9L/6.7L
• Freeze/core plug support for common-rail blocks:
  CUMMINS 4938189 OEM EXPANSION PLUG (FREEZE / CORE PLUG) – 5.9L/6.7L (2003–2018)
• Block heater element for cold-climate starts:
  CUMMINS 3975628 OEM ENGINE BLOCK HEATER ELEMENT – 5.9L/6.7L (1998.5–2021)

Installation Notes

• Drain coolant to below thermostat level and allow the engine to cool before service.
• Clean the housing and block mating surfaces thoroughly; remove old seal material.
• Install a new Cummins 3954829 seal with the thermostat in the correct orientation.
• Torque thermostat housing fasteners to the factory specification.
• Refill with correct coolant, bleed air, and verify stable 190°F operating temperature.

Specifications for cummins 5292744

FAQ

WILL THIS CUMMINS 5292744 THERMOSTAT FIT MY 2003–2007 5.9L CUMMINS RAM?

Yes. Cummins 5292744 is the OE 190°F thermostat used on most 2003–2007 Ram 2500/3500 trucks with the 5.9L ISB common-rail engine. Because some cab-and-chassis and non-US builds can differ, CPP Diesel recommends confirming with your VIN or ESN if you are unsure.

DOES THIS THERMOSTAT COME WITH THE SEAL OR GASKET?

Many genuine Cummins kits include the sealing ring, but not all. To avoid leaks, we strongly recommend ordering a new Cummins 3954829 thermostat housing seal at the same time and replacing it whenever you change the thermostat.

WHAT’S THE DIFFERENCE BETWEEN 5292744 AND 5292742 THERMOSTATS?

5292744 is a ~190°F thermostat that maintains stock operating temperature on 5.9L ISB trucks. The Cummins 5292742 180° thermostat opens earlier, which some owners prefer in hot climates, heavy towing, or certain tuning scenarios. Both are genuine Cummins parts; choose based on your goals and climate.

SHOULD I CHANGE COOLANT WHEN I INSTALL THIS THERMOSTAT?

At minimum you’ll need to top off coolant after the job. If the coolant is old, contaminated, or you’re addressing an overheating issue, it’s smart to drain, flush, and refill with fresh coolant that meets the OEM spec. Always bleed air from the system and verify stable operating temperature on a road test.

WHAT OTHER CUMMINS COOLING PARTS PAIR WELL WITH THIS THERMOSTAT?

For a complete cooling refresh on a 5.9L common-rail, many owners also add a new thermostat seal, address freeze plugs, and upgrade cold-weather capability with a block heater. Popular genuine Cummins pairings include: 3954829 thermostat housing seal , 3905401 side expansion plug , 4938189 freeze/core plug , and 3975628 block heater element .