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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1284 (Engine Cooling System) >> Repair Instructions >> Engine Coolant Thermostat Replacement (LMM) >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the thermostats for sticking, cracks, and/or leakage of wax.
  2. Replace the thermostats if damage is found.
  3. Clean the thermostat housing and thermostat housing cover sealing surfaces.
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