AutoZone 1999 Cadillac Eldorado 4.6L SFI DOHC 8cyl | Repair Guides | Heating, Ventilation, & Air Conditioning | Heater Core | Removal & Installation | AutoZone.com

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    1999 Cadillac Eldorado 4.6L SFI DOHC 8cyl

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    GrandPrix, Impala 2006-2008, Monte Carlo 2006-2007

    Removal & Installation

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    1. Before servicing the vehicle, refer to the Precautions Section.
    2.  
    3. Disconnect the negative battery cable.
    4.  
    5. Drain the engine coolant into a clean container for reuse.
    6.  
    7. On Grand Prix or Regal equipped with a 3.8L engine, remove the fuel injector sight shield.
    8.  
    9. Remove or disconnect the following:

      Lower floor console, if equipped
       
      Both instrument panel insulators
       
      Heater core outlet cover screws and the outlet cover
       
      Heater core cover screws and the cover
       
      Heater core seals. Discard the seals
       
      Heater core outer seal. Discard the seal
       
      Heater core line clamp screw, the retaining clamp and the pipe retainer clamp screw
       
      Heater core from the lower case
       
      Heater core lower, center, upper and side seals from the lower heater core case. Discard the seals

      Click image to see an enlarged view

      Fig. View of the heater core outlet cover-Grand Prix



      Click image to see an enlarged view

      Fig. View of the heater core cover-Grand Prix



      Click image to see an enlarged view

      Fig. Location of the heater core cover seals-Grand Prix



      Click image to see an enlarged view

      Fig. View of the heater core outer seal-Grand Prix



      Click image to see an enlarged view

      Fig. View of the heater core-Grand Prix



      Click image to see an enlarged view

      Fig. View of the heater core lower, center, upper and side seals of the lower heater core case-Grand Prix

       

    10.  

    To install:

    1. Install or connect the following:

      New heater core lower, center, upper and side seals to the lower heater core case
       
      Heater core to the lower case
       
      Pipe retainer clamp screw, the retaining clamp and the heater core line clamp screw
       
      Heater core outer seal
       
      Heater core seals
       
      Heater core cover and the outlet cover screws, then, tighten the screws to 13 inch lbs. (1.5 Nm)
       
      Heater core outlet cover and the outlet cover screws, then, tighten the screws to 13 inch lbs. (1.5 Nm)
       
      Both instrument panel insulators
       
      Lower floor console, if equipped
       

    2.  
    3. On Grand Prix or Regal equipped with a 3.8L engine, install the fuel injector sight shield.
    4.  
    5. Refill the engine cooling system.
    6.  
    7. Connect the negative battery cable.
    8.  
    9. Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
    10.  

    1. Before servicing the vehicle, refer to the Precautions Section.
    2.  
    3. Disconnect the negative battery cable.
    4.  
    5. If equipped with a 3.8L engine, remove the fuel injector sight shield by performing the following procedures:
      1. Clean the area around the oil filler cap/tube assembly location.
      2.  
      3. Rotate the oil filler cap/tube assembly counterclockwise from the valve cover.
      4.  
      5. Lift the fuel injector sight shield up at the front and slide it from the rear engine bracket.
      6.  
      7. Reinstall the oil filler cap/tube assembly in the valve cover.
        CAUTION
        Before draining the cooling system, allow the engine to cool to relieve the systems internal pressure and to avoid scalding coolant.

      8.  

    6.  
    7. Drain the cooling system by performing the following procedure:
      1. Raise and safely support the front of the vehicle.
      2.  
      3. Remove and clean the coolant recovery tank.
      4.  
      5. Place a 2 gallon pan under the radiator to catch the coolant.
      6.  
      7. At the bottom of the radiator, open the drain valve and drain the coolant to a level lower than the heater core.
      8.  
      9. Remove the radiator cap and open the air bleed screw (2-3 turns) located on top of the thermostat housing.
      10.  
      11. After sufficient coolant has been drained from the system, close the drain valve.
        CAUTION
        Engine coolant is a hazardous waste; it should be stored for reuse or submitted for recycling. NEVER dispose of it by dumping it into the environment.

      12.  

    8.  
    9. Disconnect and plug the heater hoses at the heater core.
    10.  
    11. If equipped, remove the lower center console by removing or disconnecting the following:

      Cigarette lighter
       
      Automatic transaxle shift handle
       
      Upper console trim plate from the front floor console by unsnapping it
       
      Electrical connectors from the upper console trim plate and remove the trim plate
       
      CD storage compartment from the front floor console by unsnapping it
       
      Raise the front floor console armrest and remove the compartment mat
       
      Console-to-chassis bolts and screws
       
      Electrical connectors from the console and remove the console from the vehicle
       

    12.  
    13. Remove the lower instrument panel lower compartment by removing or disconnecting the following:

      Lower right instrument panel insulator
       
      Compartment-to-panel bolts and screws, from under the instrument panel compartment
       
      Instrument panel compartment door screws and the door
       
      Instrument panel compartment screws and plastic clips; then slide the compartment from the instrument panel
       
      Electrical connector from the compartment
       
      Ashtray and bracket, if necessary
       
      Lower heater duct
       
      Heater core cover and discard the cover seals
       
      Heater core mounting clip and bracket
       
      Heater core

      Click image to see an enlarged view

      Fig. View of the radiator drain valve-Grand Prix, Impala, Monte Carlo



      Click image to see an enlarged view

      Fig. View of the fuel injector sight shield-Grand Prix, Impala, Monte Carlo



      Click image to see an enlarged view

      Fig. Exploded view of the instrument panel-Grand Prix, Impala, Monte Carlo



      Click image to see an enlarged view

      Fig. View of the heater core-Grand Prix, Impala, Monte Carlo

       

    14.  

    To install:

    1. Install and connect the following:

      Heater core in the vehicle
       
      Heater core mounting clip and bracket
       
      New seals on the heater core cover
       
      Heater core cover and torque the bolts to 13 inch lbs. (1.5 Nm)
       
      Lower heater duct, if removed
       
      Ashtray and bracket, if removed
       

    2.  
    3. Install the lower instrument panel lower by installing or connecting the following:

      Electrical connector to the compartment
       
      Slide the compartment into the instrument panel; then, secure it with screws and plastic clips
       
      Instrument panel compartment door and screws
       
      Compartment-to-panel bolts and screws, located under the instrument panel compartment
       
      Lower right instrument panel insulator
       

    4.  
    5. If equipped, install the lower center console install or connect the following:

      Console in the vehicle and connect the electrical connectors
       
      Console-to-chassis bolts and screws, tighten in sequence beginning at the front right and continue in a clockwise order to 106 inch lbs. (12 Nm)
       
      Armrest compartment mat and lower the front floor console armrest
       
      C/D storage compartment into the front floor console
       
      Electrical connectors to the upper console trim plate and snap the trim plate onto the console
       
      Automatic transaxle shift handle and the cigarette lighter
       
      Heater hoses to the heater core and secure with the clamps
       

    6.  
    7. Refill the cooling system by performing the following procedure:
      1. Close the radiator drain valve.
      2.  
      3. If the air bleed screws (located at the top of the thermostat housing) is closed, open it by turning it 2-3 turns.
      4.  
      5. Slowly add coolant until it reaches the radiator neck.
      6.  
      7. Wait for 2 minutes and recheck the coolant level; then, add more coolant if necessary.
      8.  
      9. Fill the coolant reservoir to the COLD mark.
      10.  
      11. Close the air bleed screw.
        WARNING
        Do not over-tighten the air bleed screw for it is made of brass.

      12.  
      13. Install the radiator cap and make sure that the arrows align with the overflow tube.
      14.  

    8.  
    9. If equipped with a 3.8L engine, install the fuel injector sight shield by performing the following procedures:
      1. Remove the oil filler cap/tube assembly from the valve cover.
      2.  
      3. Slide the fuel injector sight shield into the rear engine bracket and lower it into place.
      4.  
      5. Reinstall the oil filler cap/tube assembly in the valve cover. Twist it clockwise to lock the detent on the tube into the notch in the valve cover.
      6.  

    10.  
    11. Connect the negative battery cable.
    12.  

     
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