How to replace heater core on Buick Regal?

Heater Core

REMOVAL & INSTALLATION

1. Disconnect the negative battery cable.

CAUTION

When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

1988-91 Vehicles

See Figure 1

Fig. Fig. 1: Heater core cover mounting-1990 vehicle shown

1. Disconnect the negative battery cable.
2. Properly drain the engine coolant into a suitable container.
3. Remove the upper weatherstrip from the body.
4. Remove the upper secondary cowl.
5. Remove the lower secondary cowl upper nut.
6. Disconnect the heater hoses from the heater core.

If you have access to an air compressor, blow out the residual coolant from the core. This will prevent coolant leakage into the passenger compartment.

7. Working inside the vehicle, remove the right and left side instrument panel sound insulators.
8. Remove the rear seat heater duct adapter.
9. Detach the lower heater duct.
10. Unfasten the heater core cover screws, then remove the heater core cover.
11. Remove the heater core from the vehicle.

To install:

12. Install the heater core in the vehicle.
13. Position the heater core cover, then install the heater core cover screws.
14. Attach the lower heater duct.
15. Install the rear seat heater duct adapter.
16. Install the right and left side instrument panel sound insulators.
17. Working inside the engine compartment, connect the heater hoses to the heater core.
18. Install the lower secondary cowl upper nut.
19. Fasten the upper secondary cowl.
20. Install the upper weatherstrip from the body.
21. Connect the negative battery cable.
22. Fill cooling system and check for leaks. Start the engine and allow to come to normal operating temperature. Recheck for coolant leaks. Allow the engine to warm up sufficiently to confirm operation of the cooling fan.

1992-96 Vehicles

See Figures 2, 3, 4 and 5

Fig. Fig. 2: Unfasten the retaining screws...

Fig. Fig. 3: ... then remove the heater core cover

Fig. Fig. 4: Removing the heater core from the vehicle-1992 Lumina shown

Fig. Fig. 5: Heater core cover removal-1995 vehicle shown

1. Relieve the fuel system pressure.
2. Disconnect the negative battery cable.
3. Remove the air cleaner and duct assembly.
4. Properly drain the engine coolant into a suitable container.
5. For 2.2L and 3.1L engines, rotate the engine forward.
6. For 1994-96 3.4L engines, remove the upper intake manifold.
7. If equipped with a 3.4L engine, perform the following:
   1. Disconnect and cap the fuel lines.
   2. Detach the upper radiator hose from the engine.
   3. Disconnect the exhaust crossover pipe.
   4. Remove the transmission dipstick tube.
8. Disconnect both hoses from the heater core by unfastening the clamps. It may be necessary to use tool J 38543 or equivalent clamp remover to unfasten the hose clamps.
9. Remove the right and left instrument panel sound insulators.
10. Remove the rear compartment heat duct adapter bolt/screw and the adapter.
11. Unfasten the heater outlet duct bolts, then remove the duct.
12. Remove the heater core cover screws, then remove the cover.
13. Remove the heater core from the vehicle.

To install:

14. Position the heater core, then install the core cover. Tighten the retaining screws to 27 inch lbs. (3 Nm).
15. Install the heater outlet duct and retaining bolts/screws. Tighten to 18 inch lbs. (2 Nm).
16. Install the rear compartment heat duct adapter and secure with the bolts/screws. Tighten to 27 inch lbs. (3 Nm).
17. Secure the right and left instrument panel sound insulators.
18. Connect both heater hoses to the heater core. Secure using the retaining clamps.
19. If equipped with a 1994-96 3.4L engine, perform the following:
    1. Install the transmission dipstick tube.
    2. Attach the exhaust crossover pipe.
    3. Connect the upper radiator hose to the engine assembly.
    4. Uncap and connect the fuel lines.
    5. Install the upper intake manifold.
20. For 2.2L and 3.1L engines, rotate the engine back to its original position.
21. Properly refill the cooling system.
22. Install the air cleaner and duct assembly, then connect the negative battery cable. Start the engine and check for proper operation and/or leaks.

This details will help.

Thanks.

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