The product images shown are Illustrative only and may not be an exact representation of the product.

Heavy Duty Thermostats

Gates only partners with prime OE thermostat manufacturers to provide OE Exact or OE Type construction for use on heavy-duty trucks, buses and tractors.

  • OE-exact designed for customers that demand the exact OEM thermostat as a replacement product.
  • Fits applications with 3/4" deep filler necks. Custom heavy-duty radiator caps available upon request.
  • OE Type - Quality controlled factory calibration assures accuracy of opening and closing, regardless of pressure changes.
  • Matches the OEM product fit, function and design.
  • Temperature sensitive heat motor provides consistent valve response for smooth performance and precise engine cooling.
  • Features including jiggle pins and check valves for air venting, seals, and gaskets make these thermostats equivalent to the original equipment parts.

All Parts

1-10 of 48 Items
Part # Product # Description Type Jiggle Pin Temperature (C) Flange Diameter Height From Flange Depth From Flange Design
74120116 34148 THERMOSTATS Heavy-Duty Thermostat false 180 Fahrenheit 3.19 in 1.67 in 1.35 in Weir-Stat
74120117 34149 THERMOSTATS Heavy-Duty Thermostat false 190 Fahrenheit 3.2 in 1.6 in 1.46 in Weir-Stat
74125747 33347 THERMOSTAT Heavy-Duty Thermostat false 170 Fahrenheit 3.52 in 1.42 in 1.42 in Side By-Pass
74125748 33348 THERMOSTAT Heavy-Duty Thermostat false 180 Fahrenheit 3.53 in 1.35 in 1.52 in Side By-Pass
74125757 33357 THERMOSTAT Heavy-Duty Thermostat false 170 Fahrenheit 2.87 in 1.73 in 2.7 in Top By-Pass
74125797 33397 THERMOSTAT Heavy-Duty Thermostat false 170 Fahrenheit 2.45 in 1.69 in 1.33 in Top By-Pass
74125818 33168 THERMOSTAT Heavy-Duty Thermostat false 180 Fahrenheit 2.46 in 1.58 in 1.4 in Top By-Pass
74125897 33447 THERMOSTAT Heavy-Duty Thermostat false 173 Fahrenheit 2.87 in 0.25 in 2.64 in Side By-Pass
74125898 33448 THERMOSTAT Heavy-Duty Thermostat false 180 Fahrenheit 2.86 in 0.3 in 2.65 in Side By-Pass
74125694 33964 THERMOSTAT Heavy-Duty Thermostat false 180 Fahrenheit 2.12 in 0.64 in 1.93 in Bottom By-Pass
1-10 of 48 Items

We've got your cooling system under control.

Gates® heavy duty thermostats are designed to speed engine warm-up and regulates the engine’s operating temperature, resulting in better fuel economy, lower emissions, exceptional engine performance and longer engine life.

Gates brings OE to the Aftermarket.

Gates® engineers our aftermarket parts in partnership with the top vehicle OEMs around the world, so you can trust premium-grade parts with exceptional fit, function, and performance in your heavy duty applications.