GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Metro 🢒 Engine 🢒 Engine Cooling 🢒 Engine Coolant Thermostat Housing Replacement

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.

    2. Object Number: 185630 Size: SH
  2. Drain the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.

    3. Object Number: 185632 Size: SH
  3. Release the hose clamp in order to remove the upper radiator hose at the thermostat housing cap.
  4. Remove the two retaining bolts in order to remove the water outlet (3) from the housing (1).
  5. Remove the thermostat (2) and the O-ring from the thermostat housing.

    6. Object Number: 185615 Size: SH
  6. Remove the Engine Coolant Temperature (ECT) sensor (3).
  7. Remove the two bolts in order to remove the thermostat housing and gasket from the cylinder head.

Installation Procedure

    Object Number: 185635 Size: SH
  1. Connect the thermostat housing and the new gasket to the cylinder head (4).

    2. 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.

  2. Secure the housing with two bolts.

    3. Tighten
    Tighten the thermostat housing bolts to 27 N·m (20 lb ft).


    Object Number: 185615 Size: SH
  3. Install the Engine Coolant Temperature (ECT) sensor (3).
  4. Install the thermostat and a new gasket to the thermostat housing (2).
  5. Install the water outlet to the housing.
  6. Secure the water outlet with two retaining bolts.

    7. Tighten
    Tighten the water outlet retaining bolts to 20 N·m (15 lb ft).

  7. Install the upper radiator hose to the thermostat housing cap.
  8. Secure the hose with a hose clamp.
  9. Refill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  10. Connect the negative battery cable.