GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1996 🢒 Blazer - 2WD 🢒 Engine 🢒 Engine Cooling 🢒 Engine Coolant Thermostat Installation

Removal Procedure

    Caution: Do not remove the radiator cap while the cooling system is hot. Serious personal injury may result. Only remove the radiator cap from a cool engine.

  1. Remove the necessary amount of coolant from the radiator. Refer to Draining and Filling Cooling System .
  2. Remove the upper radiator inlet hose.

    3. Object Number: 4150 Size: SH
  3. Remove the coolant outlet nuts.

    4. Object Number: 4149 Size: SH
  4. Remove the coolant outlet from the engine.
  5. Remove the thermostat gasket, if used.

    6. Object Number: 4148 Size: SH
  6. Remove the coolant thermostat.

Cleaning Procedure
    • Clean all the parts.
    • Clean all the sealing surfaces.

Installation Procedure

    Object Number: 4148 Size: SH
  1. Install the thermostat to the engine.
  2. Install the new thermostat gasket (if used). Otherwise, place a 3 mm (1/8 in) bead of RTV sealer (GM P/N 1052289, or equivalent) in the groove of the coolant outlet sealing surface.

    3. Object Number: 4149 Size: SH
  3. Install the coolant outlet to the engine.

    4. Object Number: 4150 Size: SH
  4. Install the coolant outlet attaching nuts.

    5. Tighten
    Tighten the coolant outlet nuts to 10 N·m (89 lb in).

    Refer to Fastener Tightning Notice in General Information.

  5. Install the upper radiator inlet hose.
  6. Fill the cooling system with the specified coolant and concentration. Refer to Radiator Replacement
  7. Inspect all of the sealing surfaces and the connections for leaks after starting the engine. Refer to Radiator Leak Testing (On and Off Vehicle)