GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Blazer - 4WD - RHD 🢒 Engine 🢒 Engine Cooling 🢒 Engine Coolant Thermostat Replacement

Removal Procedure

    Object Number: 371343 Size: SH
  1. Remove the necessary coolant from the radiator. Refer to Cooling System Draining and Filling .
  2. Remove the radiator inlet hose. Refer to Radiator Hose Replacement .
  3. Remove the coolant outlet bolts.
  4. Remove the coolant outlet from the lower intake manifold.
  5. Remove the thermostat gasket.

    6. Object Number: 42903 Size: SH
  6. Remove the coolant thermostat.
  7. Clean all the sealing surfaces of the coolant outlet.
  8. Clean the sealing surface on the lower intake manifold.

Installation Procedure

    Object Number: 42903 Size: SH

    Important: In order to prevent leakage, thoroughly clean all parts and sealing surfaces.

  1. Install the coolant thermostat in the lower intake manifold.

    2. Object Number: 371343 Size: SH
  2. Install a new gasket (if used). Otherwise, place a 3 mm (1/8 in) bead of RTV sealer (GM P/N 1052289, or equivalent) at the groove on the coolant outlet sealing surface.
  3. Install the coolant outlet on the lower intake manifold.

    4. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the attaching bolts.

    5. Tighten
    Tighten coolant outlet bolts to 19 N·m (14 lb ft).

  5. Install the radiator inlet hose. Refer to Radiator Hose Replacement .
  6. Fill the cooling system with specified coolant and concentration. Refer to Radiator Replacement .
  7. Inspect all sealing surfaces for leaks after starting the engine. Refer to Cooling System Leak Testing .