CUMMINS 5292742 OEM 180° THERMOSTAT – 5.9L ISB (1998.5–2007) | 4BT

Product Description

The CUMMINS 5292742 OEM 180° THERMOSTAT is the factory-correct temperature regulator for 5.9L ISB engines (1998.5–2007) and the durable Cummins 4BT platform. Designed to deliver fast warm-up, consistent coolant flow, and stable operating temperatures, this genuine Cummins thermostat restores the precise thermal control your engine was engineered for.

Unlike aftermarket thermostats that often run cold or cycle erratically, the 5292742 uses Cummins-calibrated wax charge and flow control geometry to maintain a steady 180°F operating temperature — protecting against cavitation, overcooling, and accelerated engine wear.

FITMENT

• 1998.5–2002 Dodge Ram 2500/3500 5.9L ISB (24-valve)
• 2003–2007 Dodge Ram 2500/3500 5.9L ISB (Common Rail)
• Industrial, agricultural, and marine 5.9L ISB platforms requiring 180° calibration
• Cummins 4BT (various industrial and repower applications)

CROSS-REFERENCE & RELATED CUMMINS PRODUCTS

• CUMMINS 3940489 OEM THERMOSTAT HOUSING – 5.9L
• CUMMINS 3947898 OEM THERMOSTAT SEAL – 5.9L
• CUMMINS 3977224 OEM WATER PUMP – 5.9L
• CUMMINS 3937736 OEM COOLANT TEMP SENSOR – 5.9L

FAQ

Is this a genuine Cummins thermostat?
Yes. The 5292742 is the OEM Cummins 180° thermostat for 5.9L ISB and 4BT applications.

Will this fit my 2003–2007 Common Rail 5.9L?
Yes — this thermostat is correct for all 2003–2007 ISB 5.9L Cummins engines.

Does this come with the thermostat seal?
The seal is not included. You should also order the CUMMINS 3947898 Thermostat Seal.

Why choose the 180° Cummins OEM thermostat?
It maintains factory-engineered operating temperatures, prevents overcooling, improves fuel efficiency, and protects internal components from thermal shock.

Is this compatible with the Cummins 4BT?
Yes — the 5292742 thermostat is commonly used in many 4BT industrial and automotive repower setups.