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How do you replace the heater core in a 1991 2.3L 16V Quad4 Oldsmobile Cutlass Calais?
Wiki User
∙ 15y ago
The heater core is behind the center unit (behind the stereo, ac, etc.) hovering above the floorboard between the passenger and driver side. Take off the black heat shield. Open your hood. In the back of the engine cavity (the engine side of the heater core). You will see two identical pipes/stems coming out. Remove any hoses, etc. from the two pipes/stems. Now, it should just be a matter of wriggling the core loose from the inside. If you can't pull it from the inside, try pushing from under the hood.
Wiki User
∙ 15y ago
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