PLEASE ENTER YOUR ENGINE SERIAL NUMBER - ESN SO WE CAN VERIFY THE CORRECT THERMOSTAT FOR YOUR ENGINE. CUMMINS PARTS ARE NON-REFUNDABLE. You must enter your EIN to purchase this part. If you are using the part number from the actual part in hand, you may enter it in the EIN field to verify this is the part you want.
This180 degree Cummins 4336659 Thermostat is an OEM replacement Thermostat for Cummins ISX/QSX Diesel engines. This thermostat is the stock replacement part needed for a leak-proof change for the correct engine operating temperatures. This Cummins Thermostat contains the following required Original Equipment Manufacturer parts:
This Cummins 4336659 Replacement Thermostat applications:
Note: If your ISX/QSX engine is experiencing coolant temperature gauge cycling, replace your existing thermostat with this Cummins 4336659 180 degree thermostat. The new Cummins 4336659 thermostat provides a slower coolant response rate to reduce dramatic engine temperature cycling. This slower engine response rate does not affect the engine performance.
The Cummins 4336659 Thermostat on your ISX/QSX Cummins engine allows low-temperature coolant from the radiator into the engine to keep the operating temperature within a predetermined range. Operating a Cummins engine with a bad thermostat will cause the thermostat to get stuck in the open or closed position. A defective thermostat will cause the engine to operate either below the correct operating temperature or above it leading to an overheat condition. If you are currently experiencing any of these symptoms, it's time to replace the Cummins thermostat to alleviate this issue.
The use of Genuine Cummins parts means you get a precision design, state-of-the-art manufacturing, and diligent testing which ensures optimum engine performance at the Cummins factory-specified level. Only Genuine Cummins parts come with a full factory warranty, giving you peace of mind and financial protection.
The Cummins 4336659 Thermostat supersedes the:
This OEM Cummins Thermostat Benefits: