GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Camaro 🢒 Engine 🢒 Engine Cooling 🢒 Engine Coolant Thermostat Housing Replacement

Engine Coolant Thermostat Housing Replacement 3.8L V6

Removal Procedure

    Object Number: 221704 Size: SH
  1. Open the radiator drain cock. Drain the engine coolant from the radiator to a level below the thermostat.
  2. Close the radiator drain cock.

    3. Tighten
    Tighten the radiator drain cock to 1.5 N·m (13 lb in).

  3. Disconnect the exhaust gas recirculation (EGR) valve electrical connector.

    4. Object Number: 470217 Size: SH
  4. Remove the EGR valve outlet pipe bolt from the upper intake manifold.
  5. Remove the EGR valve outlet pipe nut from the EGR valve adapter.
  6. Remove the EGR valve pipe.

    7. Object Number: 11686 Size: SH
  7. Loosen the hose clamp (3).
  8. Remove the inlet hose (4) from the water outlet (2).
  9. Remove the water outlet bolts (1).
  10. Remove the water outlet (2).
  11. Remove the water outlet gasket (6).

Installation Procedure

    Object Number: 11686 Size: SH
  1. Install a new water outlet gasket (6).
  2. Install the water outlet (2).
  3. Install the water outlet bolts (1).

    4. Tighten
    Tighten the water outlet bolts (1) to 27 N·m (20 lb ft).

  4. Install the inlet hose (4) to the water outlet (2).
  5. Install the hose clamp (3).

    6. Object Number: 470217 Size: SH
  6. Install the EGR valve pipe.
  7. Install the EGR valve outlet pipe nut to the EGR valve adapter.

    8. Tighten
    Tighten the EGR valve outlet pipe nut to 29 N·m (21 lb ft).

  8. Install the EGR valve outlet pipe bolt to the upper intake manifold.

    9. Tighten
    Tighten the EGR valve outlet pipe bolt to 29 N·m (21 lb ft).


    Object Number: 221704 Size: SH
  9. Disconnect the exhaust gas recirculation (EGR) valve electrical connector.

Engine Coolant Thermostat Housing Replacement 5.7L V8

Removal Procedure

    Object Number: 221671 Size: SH
  1. Open the radiator drain cock. Drain the engine coolant from the radiator to a level below the thermostat.
  2. Close the radiator drain cock.

    3. Tighten
    Tighten the radiator drain cock to 1.5 N·m (13 lb in).

  3. Remove the radiator outlet hose from the water outlet.

    4. Object Number: 221708 Size: SH
  4. Remove the water outlet housing bolts.
  5. Remove the water outlet and gasket.

Installation Procedure

    Object Number: 221708 Size: SH
  1. Thoroughly clean the water outlet and water pump surfaces.
  2. Install the water outlet and gasket.
  3. Install the water outlet bolts.

    4. Tighten
    Tighten the water outlet bolts to 10 N·m (89 lb in).


    Object Number: 221671 Size: SH
  4. Install the radiator outlet hose to the water outlet.
  5. Add engine coolant, if required.