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Chevrolet Sonic Repair Manual: Engine Coolant Thermostat Replacement (LUW)

Chevrolet Sonic Repair Manual / Powertrain / Engine / Engine Cooling / Thermostat / Engine Coolant Thermostat Replacement (LUW)

Removal Procedure

    Warning:

    Refer to Battery Disconnect Warning.

  1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection.
  2. Drain the coolant. Refer to Cooling System Draining and Filling.


  3. Disconnect the engine wiring harness connector (1) and retainers (2).

  4. Remove the wiring harness bracket nut (3) and bracket (4).

  5. If equipped, disconnect the thermostat heating element sensor (1) and remove the radiator inlet hose (2).

  6. Remove the thermostat housing retaining bolts (1).

  7. Remove the thermostat (1) and discard the seal (2).
Installation Procedure

    Fit the thermostat (1) to the thermostat housing using a NEW seal (2).
  1. Fit the thermostat (1) to the thermostat housing using a NEW seal (2).

    2. Caution:

    Refer to Fastener Caution.

  2. Install the thermostat (2) and tighten the thermostat bolts (1) to 10 Y (89 lb in)

    .



  3. Install the radiator inlet hose (2) and connect the thermostat heating element sensor (1).

  4. Install the wiring harness bracket (4) and tighten the nut (3) to 10 Y (89 lb in)

    .



  5. Connect the engine harness connector (1) and harness retainers (2) to the bracket.
  6. Refill the engine cooling system. Refer to Cooling System Draining and Filling.
  7. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection.
  8. Start the engine and check for coolant leaks.
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Caution: Refer to Engine Coolant Thermostat Housing Caution. Clean sealing surface. Install a NEW engine coolant thermostat housing seal. Install the engine coolant thermosta ...

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