Cummins 3928639 180 Degree Thermostat

Cummins 3928639 Replacement 180-Degree Thermostat

Enhance your engine’s performance with the authentic Cummins 3928639 Replacement Thermostat. Designed as an OEM solution for Cummins diesel engines, this thermostat maintains optimal operating temperatures and delivers dependable, leak-proof performance for engines such as the ISC, 6C8.3, GTA8.3, ISC8.3, ISL, ISL8.9, ISL9, L9, QSC8.3, and QSL9.3.

Key Features

• Part Number: 3928639
• Thermostat Opening Temperature: 82.2°C (180°F)
• Compatibility: Built for numerous Cummins models, including the ISC series, among others
• Quality & Warranty: Genuine Cummins quality with a full factory warranty and precision engineering
• Supersedes: Former part numbers 3901845 and 3907242

Benefits of OEM Cummins Parts

Using OEM parts like this thermostat means you’re investing in durability, an exact fit, and reliable performance. Made in state-of-the-art facilities in the USA, this thermostat meets strict quality control and testing standards to ensure your engine runs efficiently. Its precise design helps minimize coolant temperature cycling and prevents overheating, thereby extending engine life and maintaining peak performance.

Installation & Troubleshooting Tips

• Notice your coolant temperature gauge fluctuating? This might indicate a valve that is sticking open or closed.
• Replace the thermostat promptly to prevent engine overheating and to sustain performance.
• Always verify your engine’s serial number (ESN) when ordering to ensure the correct fit.

For more genuine replacement parts, visit our Cummins OEM Replacement Parts collection or explore our range of Thermostats.

Enter your engine serial number (ESN) at checkout to verify compatibility and enjoy reliable performance from your genuine Cummins thermostat.