DIY- Replacing the Heater Core on a '04 LeSabre - Buick Forum - Buick Enthusiasts Forums

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Old 10-11-2011, 01:20 PM
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Join Date: Jun 2011
Posts: 33
Default DIY- Replacing the Heater Core on a '04 LeSabre

Hello all,

I had received a request from hanky to post up the walk-through for replacing the heater core on a LeSabre, so here it is. Enjoy!

1) Disconnect the negative battery cable.

2) Drain the cooling system into a clean container for reuse.

3) Remove the heater hoses from the heater core.

4) Remove the right sound insulator.

5) Disconnect all necessary electrical connectors and remove the instrument panel compartment.

6) Remove the temperature valve actuator.

7) Disconnect the electrical connector and remove the HVAC programmer.

8) Remove the heater core cover-to-heater assembly screws and the cover.

9) Remove the heater core-to-heater assembly screws and the heater core.

**Shown here: Heater hoses and clamp positions**

**Shown here: Heater core cover**


1) Install the heater core and the heater core-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm).

2) Install the heater core cover and the cover-to-heater assembly screws, then, tighten the screws to 12 inch lbs. (1.4 Nm).

3) Install the HVAC programmer and connect the electrical connector.

4) Install the temperature valve actuator. (ref #7 in the diagram below)

5) Install the instrument panel compartment and connect any necessary electrical connectors.

6) Install the right sound insulator.

7) Install the heater hoses to the heater core. (ref #22 in the diagram below)

8) Refill the cooling system.

9) Connect the negative battery cable.

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

*diagram courtesy of; all rights reserved
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Old 10-11-2011, 02:10 PM
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Join Date: Sep 2010
Posts: 646

Thank you for the prompt reply. Now lets hope the gentleman that requested the procedure finds it.
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Old 01-18-2012, 08:25 PM
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Join Date: Jan 2012
Posts: 1

BuickBag, I know this is an old thread but is changing the heater core on a '97 similar to this '94? Thanks, Jim
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Old 03-03-2013, 12:16 PM
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Join Date: Mar 2013
Posts: 1

Thank you for the immediate response. Now lets wish the man that asked for the process discovers it.
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