Gates 33168 Engine Coolant Thermostat

Heavy-Duty Cooling Control

The Gates Heavy-Duty Thermostat 33168 is an engine coolant thermostat built for demanding underhood conditions in heavy-duty truck, bus, tractor, and equipment service. It uses steel, brass, and copper construction with a top by-pass design and opens at 180°F (82°C) for controlled coolant flow.

For buyers searching for a Gates 33168 thermostat, this part is a direct-fit style cooling component for heavy-duty cooling systems where stable temperature regulation matters. It is also a relevant replacement for select heavy-duty vehicle applications, including International Harvester truck and tractor platforms.

Key Features

• Heavy-duty thermostat for engine coolant temperature regulation
• Top by-pass design for heavy-duty cooling system layouts
• Start-to-open temperature: 180°F / 82°C
• Steel, brass, and copper construction
• Sealing flange outside diameter: 2.46 in.
• Valve diameter: 1.6 in.
• Height from flange: 1.58 in.
• No jiggle pin weep hole
• No installation tool included

Product Details

Gates Green Stripe Heavy-Duty Thermostats are engineered for the vibration, noise, and harsh operating conditions common in commercial diesel cooling systems. The 33168 thermostat helps regulate coolant temperature by opening at the specified temperature point, supporting consistent engine warm-up and operating temperature control in heavy-duty truck, bus, tractor, and heavy equipment use. This Gates 33168 part number is also cross-referenced with Motorad 440-180 for the same application.

What It Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuation in heavy-duty cooling systems
• Thermostat wear from vibration and harsh service conditions
• Cooling system service on select International Harvester truck and tractor applications
• Replacement needs for heavy-duty coolant flow control

Installation Notes

Verify the thermostat dimensions, top by-pass design, and 180°F opening temperature before installation. Confirm housing fitment, sealing flange diameter, and valve diameter against the original part. Use the correct coolant service procedure and inspect the thermostat housing and sealing surfaces before assembly. This Gates 33168 thermostat does not include an installation tool.

Quality Assurance

Gates positions the Green Stripe Heavy-Duty Thermostat line for commercial-duty cooling environments where durability under vibration and heat cycling is important. The 33168 is built with steel, brass, and copper materials to support dependable thermostat operation in heavy-duty service.