HowToRepairGuide.com: How to remove heater core on Chevrolet Monte Carlo?

Removal & Installation

Before servicing the vehicle, refer to the Precautions Section.

Disconnect the negative battery cable.

If equipped with a 3.1L engine, remove the air cleaner and duct assembly.

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. Rotate the oil filler cap/tube assembly counterclockwise from the valve cover.
3. Lift the fuel injector sight shield up at the front and slide it from the rear engine bracket.
4. 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.

Drain the cooling system by performing the following procedure:
1. Raise and safely support the front of the vehicle.
2. Remove and clean the coolant recovery tank.
3. Place a 2 gallon pan under the radiator to catch the coolant.
4. At the bottom of the radiator, open the drain valve and drain the coolant to a level lower than the heater core.
5. Remove the radiator cap and open the air bleed screw (2-3 turns) located on top of the thermostat housing.
6. 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.

Disconnect and plug the heater hoses at the heater core.

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

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

Fig. View of the radiator drain valve-Century, Grand Prix, Intrigue, Lumina, Monte Carlo and Regal

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

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

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

To install:

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

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

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

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

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. Slide the fuel injector sight shield into the rear engine bracket and lower it into place.
3. 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.

If equipped with a 3.1L engine, install the air cleaner and duct assembly.

Connect the negative battery cable.

Before servicing the vehicle, refer to the Precautions Section.

Disconnect the negative battery cable.

Drain the engine coolant into a clean container for reuse.

On Grand Prix or Regal equipped with a 3.1L engine, remove the air cleaner and duct assembly.

On Grand Prix or Regal equipped with a 3.8L engine, remove the fuel injector sight shield.

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

Fig. View of the heater core outlet cover-Grand Prix, Intrigue and Regal

Fig. View of the heater core cover-Grand Prix, Intrigue and Regal

Fig. Location of the heater core cover seals-Grand Prix, Intrigue and Regal

Fig. View of the heater core outer seal-Grand Prix, Intrigue and Regal

Fig. View of the heater core-Grand Prix, Intrigue and Regal

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

To install:

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

On Grand Prix or Regal equipped with a 3.8L engine, install the fuel injector sight shield.

On Grand Prix or Regal equipped with a 3.1L engine, install the air cleaner and duct assembly.

Refill the engine cooling system.

Connect the negative battery cable.

Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Before servicing the vehicle, refer to the Precautions Section.

Disconnect the negative battery cable.

Drain the engine coolant into a clean container for reuse.

On Grand Prix or Regal equipped with a 3.8L engine, remove the fuel injector sight shield.

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

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

Fig. View of the heater core cover-Grand Prix

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

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

Fig. View of the heater core-Grand Prix

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

To install:

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

On Grand Prix or Regal equipped with a 3.8L engine, install the fuel injector sight shield.

Refill the engine cooling system.

Connect the negative battery cable.

Operate the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Before servicing the vehicle, refer to the Precautions Section.

Disconnect the negative battery cable.

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. Rotate the oil filler cap/tube assembly counterclockwise from the valve cover.
3. Lift the fuel injector sight shield up at the front and slide it from the rear engine bracket.
4. 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.

Drain the cooling system by performing the following procedure:
1. Raise and safely support the front of the vehicle.
2. Remove and clean the coolant recovery tank.
3. Place a 2 gallon pan under the radiator to catch the coolant.
4. At the bottom of the radiator, open the drain valve and drain the coolant to a level lower than the heater core.
5. Remove the radiator cap and open the air bleed screw (2-3 turns) located on top of the thermostat housing.
6. 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.

Disconnect and plug the heater hoses at the heater core.

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

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

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

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

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

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

To install:

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

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

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

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

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. Slide the fuel injector sight shield into the rear engine bracket and lower it into place.
3. 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.

Connect the negative battery cable.

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