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GATES 34253  
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GATES 34253 Specifications
By-Pass Flange Diameter (IN)1.36
DesignBottom By-Pass
Height Between Flanges1.61"
Height from Flange (IN).75
Includes Installation ToolNo
Jiggle Pin Weep HoleYes
MaterialSteel, Brass, Copper
Number of Gaskets0
Number of Jiggle Pins/Check Valves1
Number of Seals1
Seal TypeO-Ring
Sealing Flange Outside Diameter2.48"
Start to Open Temperature180 Degrees F
TypeOE Type Thermostat
180 Degree; OE Type; Includes Seal

Gates only partners with prime OE thermostat manufacturers to provide OE Exact construction.

  • Designed for customers that demand the exact OEM thermostat as a replacement product.
  • 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.
Which Thermostat Is Right For You?

Type Lifespan Flow Rate Precise Temperature Control Fail-Safe Engine Protection
Standard Replacement
★★ ★★
★★ ★★ ★★
Heavy Duty ★★★ ★★ ★★★
★★ ★★
What Temperature Thermostat Do I Need?

Thermostats have a “rated” temperature (such as 180F or 195F). This is the temperature the thermostat will start to open, releasing heated coolant from the engine into the radiator. The thermostat will fully open once the coolant gets another ten or fifteen degrees warmer.


These thermostats match the OEM-specified temperature rating for the vehicle. Manufacturers recommend an OE temperature thermostat for most engines, especially for:

  • Modern engines with computers that use the coolant temperature to help control the fuel, emissions and other important systems


These thermostats have a temperature rating below (cooler than) the OEM-specified temperature rating for the vehicle. This option may make sense for use in:

  • Modified Engines
  • Performance Applications
  • Older / Classic Vehicles
Cooling System Maintenance | Tips & Tools

Without regular maintenance, cooling system components will degrade and fail prematurely, which can lead to costly engine damage. Protect your engine with simple preventative maintenance:

  • Completely drain and flush the system using Cooling System Flush prior to installation. Flushing the system is critical to prevent system contamination and failure.
  • Consider replacing the Radiator Hoses (and Hose Clamps) and Radiator Cap as part of routine preventative maintenance. System contamination can cause these parts to degrade and fail over time, which can lead to severe engine damage from overheating.
  • Refill radiator with fresh Coolant / Antifreeze according to the volume and formula specified in your Owner's Manual. Inspect levels and condition every year.
Additional Resources

Understanding Coolant Technology and Selection

Attention California Customers - Warning: Cancer and Reproductive Harm -

GATES Warranty Information:
Limited Lifetime
Warranty Details