GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 DeVille 🢒 Engine 🢒 Engine Cooling 🢒 Thermostat Housing Crossover Replacement

Removal Procedure

    Object Number: 70891 Size: SH
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling .

  2. Remove the fuel injector sight shield.
  3. Remove the upper filler panel. Refer to Filler Panel Replacement - Upper
  4. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement
  5. Remove the throttle body. Refer to Throttle Body Assembly Replacement in Engine Controls.
  6. Remove the EGR pipe at the throttle body spacer.

    7. Object Number: 71140 Size: SH
  7. Disconnect the upper radiator hose from housing.

    8. Object Number: 71141 Size: SH
  8. Disconnect the lower radiator hose from the thermostat housing.

    9. Object Number: 315078 Size: SH
  9. Remove the water pump belt cover (1).

    10. Object Number: 350285 Size: SH
  10. Remove the water pump belt tensioner (1).
  11. Remove the water pump belt.
  12. Remove the throttle body spacer.
  13. Remove the EGR. Refer to Exhaust Gas Recirculation Valve Replacement
  14. Disconnect the EGR pipe from the water crossover.
  15. Disconnect the park neutral switch.

    16. Object Number: 69918 Size: SH
  16. Remove the water pump cover.

    17. Object Number: 53229 Size: SH
  17. Remove the water crossover from the engine.

Installation Procedure

    Object Number: 53229 Size: SH

    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.

  1. Install the water crossover on the engine.

    2. Tighten
    Tighten the water crossover bolts to 25 N·m (18 lb ft).


    Object Number: 69918 Size: SH
  2. Install the water pump cover.

    3. Tighten
    Tighten the water pump cover to 10 N·m (89 lb in).

  3. Connect the park neutral switch.
  4. Connect the EGR pipe to the water crossover.
  5. Install the EGR. Refer to Exhaust Gas Recirculation Valve Replacement
  6. Install the throttle body spacer.
  7. Install the water pump belt.

    8. Object Number: 350285 Size: SH
  8. Install the water pump belt tensioner (1).

    9. Object Number: 69921 Size: SH
  9. Install the water pump belt cover (1).

    10. Object Number: 71141 Size: SH
  10. Connect the lower radiator hose to the thermostat housing.

    11. Object Number: 71140 Size: SH
  11. Connect the upper radiator hose to the housing.
  12. Install the EGR pipe to the throttle body spacer.

    13. Object Number: 70891 Size: SH
  13. Install the throttle body. Refer to Throttle Body Assembly Replacement
  14. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement
  15. Install the upper filler panel.
  16. Install the fuel injector sight shield.
  17. Refill the engine cooling system. Refer to Cooling System Draining and Filling .