Gates 33956 Engine Coolant Thermostat

Gates OE Type Thermostat 33956

The Gates OE Type Thermostat 33956 provides direct-fit engine coolant temperature control for select Ram and Dodge Ram heavy-duty applications. Built with an OE-style reverse poppet design, it helps maintain stable operating temperature and supports leak-free sealing at the thermostat housing.

Compatible with 1998-2007 Dodge Ram 2500 and Dodge Ram 3500, as well as 2013-2020 Ram 2500 and Ram 3500, this thermostat is a practical replacement for trucks that need accurate coolant flow control. Gates 33956 is built for OE performance and OEM-equivalent fit.

Key Features

• OE Type Thermostat for engine coolant temperature regulation
• Reverse poppet design for OE-style operation
• Start to open temperature: 180°F / 82°C
• Stainless steel and copper construction for corrosion resistance
• O-ring seal type with integrated seal material
• Jiggle pin weep hole for air bleeding during service
• OE performance rating for factory-style replacement fit

Product Details

Gates OE Type Thermostats are engineered for precise temperature control and a leak-free fit that matches OEM expectations. Part number 33956 uses a reverse poppet layout, stainless steel and copper materials, and an O-ring sealing design to support consistent coolant regulation in demanding truck cooling systems. This thermostat is a direct replacement choice for Ram 2500, Ram 3500, Dodge Ram 2500, and Dodge Ram 3500 models listed in the fitment data.

This part cross-references Motorad 426-180 for the same application.

Common Cooling Issues This Part Can Address

• Engine running too cool or taking too long to reach operating temperature
• Engine overheating caused by a thermostat that no longer opens correctly
• Coolant seepage at the thermostat housing seal
• Temperature fluctuation from inconsistent thermostat response
• Air trapped in the cooling system after service

Installation Notes

Verify the thermostat orientation before installation and confirm the sealing surfaces are clean and free of old gasket material. This thermostat uses an O-ring seal and does not include an installation tool. Confirm the 180°F opening specification and match the application to the listed Ram 2500, Ram 3500, Dodge Ram 2500, or Dodge Ram 3500 fitment before service.

Quality Assurance

Gates OE Type Thermostats are built to provide OEM-equivalent fit and temperature control for replacement cooling system service. Part number 33956 is manufactured to support reliable sealing and consistent operation in the specified applications.