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Engine Coolant Thermostat Housing Cleaning and Inspection

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Thermostat Housing Inspection Areas
    GM663758Courtesy of GENERAL MOTORS CORP.
  1. Clean the thermostat housing.
  2. Clean the thermostat housing mating surfaces.
  3. Inspect the thermostat housing for cracks.
  4. Inspect the thermostat housing mating surfaces for damage.
  5. Replace the thermostat housing if any damage is found.
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