Hold your heavy-duty cooling system at its proper operating temperature with the Motorad Engine Coolant Thermostat 4072-90, an OE-design thermostat built for demanding truck and bus cooling systems. It drops in as a direct-fit replacement across a broad heavy-duty lineup, including the 2000-2010 Ford F-650 and F-750 [L6-7.2L], Chevrolet C6500/C7500 Kodiak [L6-7.2L], Freightliner FS65 and M2 106, and Blue Bird All American and Vision school buses — the listed applications also cover engines coded 6-8.1L, All, L4-4.3L, L4-4.8L, L6-6.4L, L6-6.6L, L6-7.2L and V8-8.1L. See the Buyer's Guide tab for the full list of 159 applications.
The thermostat regulates coolant flow so the engine warms up and holds temperature; if a stuck or worn original is the cause of overheating or slow warm-up, this replaces it.
- Copper case & wax compound: for rapid response to coolant temperature changes.
- Construction: high-grade stainless steel and copper.
- Start-to-open: 190°F (87.78°C), a heavy-duty rating.
- Jiggle-pin weep hole with check valve: to help bleed trapped air.
- 100% tested and calibrated; meets or exceeds OEM standards.
A gasket or seal is required but not included, and no installation tool is included — consult the vehicle service information for the correct sealing components. Country of origin: China. Manufacturer part number 4072-90.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this thermostat do?
It regulates coolant flow through the cooling system so the engine reaches and holds its operating temperature, opening as the coolant warms to route flow toward the radiator.
What is the start-to-open temperature?
This heavy-duty thermostat is rated to start opening at 190°F (87.78°C).
Does it include a gasket, seal, or installation tool?
No. A gasket or seal is required for installation but is not included, and no installation tool is included. Consult the vehicle service information for the correct sealing components.
What is the thermostat made of?
It uses high-grade stainless steel and copper construction with a copper case and wax compound for rapid response to coolant temperature changes.
Will this fit my vehicle?
It is a direct-fit replacement for 159 listed heavy-duty applications, including Ford F-650/F-750, Chevrolet Kodiak, Freightliner and Blue Bird models. Check the Buyer's Guide tab to confirm your vehicle and engine.
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