Gates 34854 Engine Coolant Thermostat

Heavy-Duty Cooling Control

The Gates Heavy-Duty Thermostat 34854 is an engine coolant thermostat built for demanding underhood conditions in trucks, buses, tractors, and heavy equipment. Its reverse poppet design and steel, brass, and copper construction support stable coolant regulation where vibration and heat cycling are constant.

For buyers searching for a Gates 34854 thermostat for heavy-duty truck cooling repair, this part is a direct-fit style engine coolant thermostat for service work that requires dependable temperature control. It is also a practical choice when replacing a worn thermostat on diesel and commercial-duty cooling systems.

Key Features

• Heavy-duty engine coolant thermostat from Gates Heavy-Duty Thermostat line
• Reverse poppet design for controlled coolant flow behavior
• Steel, brass, and copper construction
• Start-to-open temperature: 180°F / 82°C
• Jiggle pin weep hole for air bleeding during cooling system service
• Sealing flange outside diameter: 2.13 in.
• Height between flanges: 1.15 in.
• Height from flange: 0.85 in.
• Compatible with applications cross-referenced to Bosch 15738 and Motorad 4060-80

Product Details

Gates Green Stripe Heavy-Duty Thermostats are engineered for the noise, vibration, and harshness found in heavy-duty truck, bus, tractor, and equipment applications. The Gates 34854 thermostat helps maintain proper operating temperature by opening at 180°F, which supports consistent coolant circulation in demanding service environments. If you are replacing a thermostat on a commercial vehicle cooling system, this part number 34854 is built around durable metal construction rather than plastic-heavy designs.

This thermostat is a strong match for service searches such as heavy-duty engine coolant thermostat replacement, reverse poppet thermostat for diesel cooling systems, and Gates 34854 thermostat for truck and equipment maintenance. It is also relevant for vehicle-specific searches involving truck, bus, and tractor cooling repairs where a 180-degree thermostat is required.

What It Helps Address

• Engine running too cool or too hot due to thermostat wear
• Delayed coolant circulation during warm-up
• Temperature fluctuation in heavy-duty cooling systems
• Air trapped in the cooling system during service
• Replacement needs for commercial truck, bus, tractor, and equipment applications

Installation Notes

Install the thermostat with the jiggle pin weep hole oriented to allow trapped air to escape during filling. Verify the housing surface is clean and inspect the sealing area before assembly. Confirm the replacement thermostat matches the required opening temperature, flange dimensions, and reverse poppet design before installation. For vehicle-specific searches, confirm the Gates 34854 thermostat matches the cooling system specification for your truck, bus, or tractor application.

Quality Assurance

Gates positions the Heavy-Duty Thermostat line for harsh commercial-duty operating conditions, using metal construction and a service-oriented design for cooling system reliability. Part number 34854 is built to meet the demands of heavy-duty maintenance and replacement work.