GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 Engine 🢒 Engine Controls - 3.0L 🢒 Coolant Heater Replacement

Removal Procedure
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling .

    2. Object Number: 159417 Size: SH
  2. If removing the engine coolant heater power supply cord with the engine coolant heater, proceed with the following steps:
    3. 2.1. Remove the right side radiator cover.

    Unscrew the self-locking tab and unclip from body.

    2.2. Remove the intake air resonator intake hose clamp and air intake hose from the air cleaner housing.
    2.3. Remove the air cleaner housing.
             2.3.1. Remove the cover.
             2.3.2. Remove the element.
             2.3.3. Unseat from the inner grommet (1) then from the outer grommets (2).
    2.4. Cut the plastic tie-wrap that is used to secure engine coolant heater power supply cord to vehicle body.

    Object Number: 389841 Size: SH
  3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Remove the engine oil filter.
  5. Unplug the engine coolant heater cord from the engine coolant heater.

    6. Object Number: 389844 Size: SH
  6. Remove the engine coolant heater.

    7. Object Number: 231222 Size: SH
  7. Note the routing of the engine coolant heater power supply cord (1) and remove the cord if applicable.

Installation Procedure

    Object Number: 389844 Size: SH
  1. Install the engine coolant heater.

    2. Tighten
    Tighten the engine coolant heater to 60 N·m (44 lb ft).


    Object Number: 389841 Size: SH
  2. Connect the engine coolant heater power supply cord to the engine coolant heater.
  3. Install the engine oil filter.

    4. Object Number: 231222 Size: SH
  4. Route the engine coolant heater power supply cord to prevent contact with hot surfaces and the areas that may wear and or pinch the cord.
  5. Lower the vehicle.
  6. Secure the engine coolant heater power supply cord (1) to the vehicle body with a plastic tie-wrap.

    7. Object Number: 159417 Size: SH
  7. If previously removed, install the air cleaner housing:
    8. 7.1. Seat the air cleaner housing onto outer the grommets (2) and then to the inner grommet (1).
    7.2. Install the element.
    7.3. Install the cover.
    7.4. Install the intake air resonator intake hose and air intake hose clamp to air cleaner housing.
    7.5. Install the right side radiator cover.

    Clip to body and secure with self-locking tab.

  8. Fill the cooling system. Refer to Cooling System Draining and Filling .