Heater Core: Service and Repair

1982 Buick LeSabre Estate Wagon V8-307 5.0LSECTION Service and Repair

Fig. 15 Heater module assembly exploded view. 1982---88 Full Size exc. Riviera & models with A/C:





1982---88 FULL SIZE MODELS EXC. RIVIERA
Less Air Conditioning
1. Disconnect battery ground cable and drain radiator.
2. Disconnect heater hoses from module, then the electrical connections from module front case.
3. Remove module front case attaching screws, then the heater core, Fig. 15.
4. Reverse procedure to install.


Fig. 16 Heater module assembly exploded view. 1982---88 Full Size with A/C exc. Riviera:





W/Air Conditioning
1. Disconnect battery ground cable and drain radiator.
2. Disconnect heater hoses from module.
3. Remove diagnostic connector and thermostatic switch from module.
4. Remove weather seal from top of module cover, then the cowl screen and windshield washer nozzle.
5. Remove module cover attaching screws.
6. Remove heater core retaining clip and the heater core from vehicle, Fig. 16.
7. Reverse procedure to install.



RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.