Specifications

The PAI Industries 181925 Thermostat is a precision-engineered engine coolant thermostat rated at 235°F, specifically designed for Cummins ISX engines in heavy-duty truck applications. Manufactured in the USA with high-quality materials and tested to meet strict OEM performance criteria, this thermostat ensures consistent temperature regulation, protects against engine overheating, and supports efficient combustion and engine longevity. It is a direct replacement for Cummins OEM 4952629 and includes industry cross references such as Cummins 3680453, Interstate-McBee M-3680453 and M-4952629 for broad compatibility. Built to withstand severe duty cycles, the 181925 Thermostat delivers dependable cooling control for commercial truck fleets and professional mechanics alike.

Compatibility

Freightliner (various Class 8 models) – 2000s–2010s
International (heavy-duty series) – 2000s–2010s
Kenworth (W900, T800 series) – 2000s–2010s
Peterbilt (379, 389 and other Class 8) – 2000s–2010s

Alternative Part Numbers

  • 3680453
  • 4952629
  • M-3680453
  • M-4952629

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