CTS 2003-2005

Removal & Installation

Print

  1. Disable the SIR system. Refer to the Chassis Electrical Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove the heater hose quick connects from the heater core pipes by performing the following procedure:
    1. At the passenger side, raise the air inlet screen and open the access door near the pollen filter.
    2.  
    3. Unlock the quick connect collars by squeezing the tabs and carefully pulling back on the tabs to disconnect the sleeve.
    4.  
    5. If green assembly marks are attached, discard them.
      WARNING
      The front wheels must be maintained in the straight-ahead position and the steering column must be in the LOCK position. Failure to do so will cause improper alignment of some components during installation and may result to damage to the SIR coil assembly.



      Click image to see an enlarged view

      Fig. View of a heater hose connector-CTS

    6.  

  8.  
  9. Remove the steering column by removing or disconnecting the following:
    WARNING
    Handle the steering column with care for it is very susceptible to damage. Dropping, leaning or hammering on it could cause damage to its collapsible design.



    Instrument panel driver knee bolster energy absorber and sound insulator
     
    Steering column electrical connector(s)
     
    Coupler bolt from the lower steering column connection and slightly separate the coupler to aid in the shaft removal
     
    Using a chisel and a hammer, rotate the forward support strap shear nut and bolt (located under the steering column) counterclockwise in order to remove them
     
    Steering column-to-rear support bracket bolt
     
    Pull the steering column straight back and through the dash panel and remove it from the vehicle.
     



    Click image to see an enlarged view

    Fig. View of the steering column assembly-CTS

  10.  
  11. Remove the instrument panel carrier by removing or disconnecting the following:
    NOTE
    It is not necessary to physically remove the instrument panel but it is necessary to pull the carrier rearward to enable the heater core to be removed from its housing.



    Windshield pillar moldings
     
    Access panel, the air deflector outlet screw, the air deflector outlet and the air outlet duct, located at the right-side of the instrument panel
     
    Instrument panel SIR (air bag) module cover, the instrument panel compartment and the SIR module
     
    Upper center console and the lower center console
     
    Center console air duct screw and the center console air duct
     
    Radio tape player bezel and the radio
     
    Climate control head
     
    Center air outlet deflector, the outlet screws and the outlet housing
     
    Driver-s side access panel
     
    Driver-s side air outlet deflector, the outlet screw and the outlet housing
     
    Driver-s side lower outlet duct
     
    Instrument cluster
     
    Fuse and relay panel screws and the panels
     
    Instrument panel carrier bolts
     
    Electrical connectors from the instrument panel and/or the wiring harness clips from the instrument panel carrier, if necessary
     
    Instrument panel carrier

    Click image to see an enlarged view

    Fig. View of the instrument panel carrier bolt locations-CTS

     



    Blower motor housing screws and the housing with the motor
     
    Heater core pipe bracket-to-chassis screw and the bracket
     
    Heater core inlet/outlet pipe bracket-to-heater core screw and the inlet/outlet pipe bracket
     
    Instrument panel support brace bolts from the instrument panel and the transmission well, then remove the brace
     
    Heater core-to-housing retaining screw. Plug the heater core pipes and protect the interior from coolant spills
     
    Heater core and the rubber seal from the heater housing

    Click image to see an enlarged view

    Fig. View of a heater core and seal-CTS

     

  12.  

To install:

  1. Install or connect the following:

    Rubber seal and heater core into the heater housing; be careful not to damage the fins
     
    Heater core-to-housing retainer screw
     
    Instrument panel support brace to the transmission well and instrument panel, then torque the bolts to 16 ft. lbs. (22 Nm)
     
    Heater core inlet/outlet pipe bracket to the heater core (using a new O-ring lightly coated with coolant), and torque the screw to 44 inch lbs. (5 Nm)
     
    Heater core pipe bracket with the screw to the chassis, be careful not to strip the screw
     
    Blower motor/housing assembly and torque the screws to 35 inch lbs. (4 Nm)
     
    Instrument panel carrier
     
    Instrument panel carrier by reversing the removal procedures and torque the instrument panel carrier bolts to 16 ft. lbs. (22 Nm)
     

  2.  
  3. Remove the steering column by installing or connecting the following:

    Steering column into the vehicle, through the dash panel and into the lower steering coupling
     
    Hand start the rear support bracket bolt, the forward support strap nut and shear bolt
     
    Rear support bracket bolt. Torque to 16 ft. lbs. (22 Nm)
     
    Forward support strap nut. Torque to 16 ft. lbs. (22 Nm)
     
    New forward support shear bolt. Torque to 15 ft. lbs. (21 Nm)
     
    Lower steering column shaft bolt and torque to 16 ft. lbs. (22 Nm)
     
    Steering column electrical connector(s)
     
    Sound insulator and the instrument panel driver knee bolster energy absorber
     

  4.  
  5. Connect the heater hoses to the heater core pipes by performing the following procedure:
    1. If not attached to the quick connect, discard the green assembly marker(s).
    2.  
    3. Push the quick connects into the pipes until they are fully seated.
    4.  
    5. Squeeze the locking tabs and press the retaining sleeve into the locked position.
    6.  
    7. At the passenger side, close the access door near the pollen filter and lower the air inlet screen.
    8.  

  6.  
  7. Refill the cooling system by performing the following procedure:
    1. Add a 50/50 mixture of water and DEX-COOL® antifreeze to the KALT/COLD mark (seam) on the surge tank.
    2.  
    3. Start the engine and allow it to idle for 1 min.
    4.  
    5. Add more coolant to the surge tank as necessary.
    6.  
    7. Install the radiator sure tank cap.
    8.  
    9. Cycle the engine, from idle to 3000 rpm, in 30 second intervals, until the engine reaches normal operating temperatures.
      NOTE
      The cooling system will bleed itself automatically during warm-up.

    10.  
    11. Turn the engine OFF and recheck the coolant level when the engine is cool
    12.  

  8.  
  9. Connect the negative battery cable.
  10.  
  11. Enable the SIR system.
  12.  
  13. Reprogram the necessary accessories.
  14.  

The heater core heats the air before it enters the vehicle. Engine coolant is circulated through the core to heat the outside air passing over the fins of the core. The core is functional at all times (no water shut-off valve is used) and may be used to temper conditioned air in the A/C mode, as well as the heat or vent mode.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cosmetic/acoustic engine cover, as equipped.
  4.  
  5. Remove the air cleaner and duct assembly.
  6.  
  7. Drain the engine coolant into a suitable container.
  8.  
  9. On the 3.4L (VIN X) engine, remove the throttle body and the throttle body tube to which it mounts.
  10.  



Click image to see an enlarged view

Fig. Heater hose arrangement-3.1L engine shown, others similar



Click image to see an enlarged view

Fig. Heater hose arrangement-3.8L engine



Click image to see an enlarged view

Fig. On some 3.1L engine, a Quick-Connect fitting as used, which requires a special tool to separate the fitting



Click image to see an enlarged view

Fig. Opening the heater core case for heater core removal

  1. Disconnect both heater hoses from the heater core. On some vehicles, accessing the firewall side heater hoses can be a challenge due to limited working space. In addition, some vehicles equipped with the 3.1L engine may have quick-connect fittings on the hose, requiring special tool J 38723 Heater Line Quick Connect Separator, or equivalent.
  2.  
  3. Remove the lower center console, if equipped. Additional information may be found in the Control Panel service instructions, found in this section.
  4.  
  5. Remove both left and right underdash sound insulator panels.
  6.  
  7. Disconnect the lower heater duct.
  8.  
  9. Remove the heater core cover. The sealer usually should be discarded and replaced with new sealer. Evaluate the condition of the existing sealer and the availability of new sealer.
  10.  
  11. Locate and remove the heater core mounting clip and bracket and remove the heater core from the vehicle. Use care as it will likely have coolant inside and could drip onto the rugs or seats.
  12.  
  13. Installation is the reverse of the removal process. After refilling the cooling system, bleed out the air and check for leaks as outlined in Section 1 of this manual.
  14.  
  15. Connect the negative battery cable.
  16.  

  1. Disconnect the negative battery cable.
  2.  
  3. If equipped with a 3.1L engine, remove the air cleaner and duct assembly.
  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-Century, Grand Prix, Intrigue, Lumina, Monte Carlo and Regal



    Click image to see an enlarged view

    Fig. View of the fuel injector sight shield-Century, Grand Prix, Intrigue, Lumina, Monte Carlo and Regal



    Click image to see an enlarged view

    Fig. Exploded view of the instrument panel-Century, Grand Prix, Intrigue, Lumina, Monte Carlo and Regal



    Click image to see an enlarged view

    Fig. View of the heater core-Century, Grand Prix, Intrigue, Lumina, Monte Carlo and Regal

     

  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. If equipped with a 3.1L engine, install the air cleaner and duct assembly.
  12.  
  13. Connect the negative battery cable.
  14.  

 
label.common.footer.alt.autozoneLogo