Details

• Brand:

  

  

• SKU:

  BR3Z-8575-G

• Other Names:

  Thermostat, Thermostat Assembly, rt1258

• Description:

  This engine coolant thermostat assembly regulates the flow of coolant between the engine block and radiator, staying closed until the engine reaches normal operating temperature and then opening to allow full coolant circulation, which keeps combustion temperatures stable and protects against both overheating and prolonged cold-running conditions that increase wear and reduce heater output. This thermostat housing is used across a broad span of Ford and Lincoln vehicles sharing common engine architectures, including Mustang GT with the 5.0L V8, Shelby GT350 and GT350R with the 5.2L flat-plane-crank V8, Explorer and Police Interceptor Utility with the 3.0L turbocharged or 3.3L hybrid engines, Lincoln Aviator with the 3.0L twin-turbo or plug-in hybrid powertrain, and Lincoln Continental with the 3.0L V6, spanning more than a decade of production across passenger car, SUV, and hybrid platforms rather than one single vehicle line. Drivers searching for this part are usually dealing with an engine that runs hot or overheats, a temperature gauge that fluctuates or climbs steadily in traffic, a check-engine light tied to a thermostat performance code, slow warm-up with weak cabin heat, or a coolant leak weeping from the housing seam. Ford's catalog lists this as a Thermostat Assembly, supplied complete with the housing, integrated thermostat, and mounting seal in one unit rather than as a bare thermostat cartridge. Always install using a fresh gasket or O-ring at the housing mating surface, refill with the correct Motorcraft coolant specification, and bleed the cooling system fully per the factory procedure to prevent trapped air pockets. Confirm the exact engine and platform application before ordering, since suffix variants of this base thermostat number are engine-specific.

• Notes: Included with thermostat housing.
• Applications: 5.0L. 3.0L. 5.2L GT500. 5.2L GT350, GT350R.
• Replaces:

  br3z8575a, br3z8575d, rt1208, rt1225

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