The Sierra 18-3647 Thermostat Kit is interchangeable with the following: GLM 13101, Mallory 9-43157, Mercruiser 807252Q5, 807252T8. Each Sierra product meets or exceeds the original equipment part it replaces. Contains 18-25...

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Product Review

The Sierra 18-3647 Thermostat Kit is interchangeable with the following: GLM 13101, Mallory 9-43157, Mercruiser 807252Q5, 807252T8. Each Sierra product meets or exceeds the original equipment part it replaces. Contains 18-2552 Thermostat Cover Gasket, 18-2553 Thermostat Cover Gasket, 18-2844 Thermostat Gasket, 18-2917 Thermostat Gasket, 18-3649 Thermostat, 18-7173 O-Ring.

  • Fits : 1987 & newer GM engines with standard cooling requiring a 160° thermostat
  • Temperature rating: 160°F
  • Visit Amazon’s SONAR parts finder at fit-guideseastarsolutionscom to ensure this product will fit your application
  • All Sierra parts qualify for and are covered under Sierra's industry leading customer satisfaction warranty
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