Cummins 4089451 Thermostat, Flow Control

Cummins 4089451 is a thermostat in Engine Parts, US catalog. Listed by US Government (DLA FLIS), October 2026.

Government data (US Government (DLA FLIS), October 2026 edition)

The U.S. government's Federal Logistics Information System (FLIS) records Cummins 4089451 as the maker's own number under government stock item NSN 6685-01-544-0148. The name and every fact below are FLIS's, credited to US Government (DLA FLIS), October 2026 edition.

Specifications recorded for government stock item NSN 6685-01-544-0148, under which this manufacturer's reference number is listed. Confirm compatibility and specifications with the manufacturer before ordering.

Government item name

Thermostat, Flow Control

Government stock item (NSN)

6685-01-544-0148

Manufacturer code (CAGE)

15434, CUMMINS INC., COLUMBUS, IN, UNITED STATES

Accessory components and quantity

Gasket,THM housing cover, 1

Opening temp rating

83.0 °C (nominal)

Special features

Thermostat type:jiggle pin; vented; thermostat fully open TEMP:95 deg. C; required housing bore diameter: 54.1 millimeters

Source: US Government (DLA FLIS), October 2026 edition, a public U.S. government data release. This is not an official DLA record and may contain errors. Verify fitment before ordering. Not affiliated with or endorsed by the Defense Logistics Agency or the Department of Defense. SearchForPart does not show a price here.

About this kind of part (general, written by SearchForPart)

Opens to send coolant to the radiator when the engine is warm. Overheating or an engine that stays cold points to a stuck thermostat. Check the opening temperature and size.

When ordering, give the part number exactly as printed and its maker, and the make, model and year of the truck, trailer, reefer unit or machine (or the engine or unit serial number). SearchForPart shows fitment only as the source printed it: check it before you order.

Availability

Not currently offered by an approved supplier. Ask us to source it and we look for a supplier.

Do you sell this part?

If you stock or supply this part, tell us about your business and what you sell.

Sell or Supply Parts

Source: US Government (DLA FLIS), October 2026 edition, a public U.S. government data release. This is not an official DLA record and may contain errors. Verify fitment before ordering. Not affiliated with or endorsed by the Defense Logistics Agency or the Department of Defense. SearchForPart does not show a price here.