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This is a more difficult than average exchange due to the compact nature of the A-body design. You have to start by removing the heater hoses - obviously. Remove the glove box insert to gain better access to the ductwork. Remove the under dash vents. Remove the heater control cable and the vacuum controller shaft where it connect to the directional flap. Around the perimeter of the ductwork, remove the connecting screws using a 5/16" nutdriver. Against the right kickpanel, there is a band that seals the duct to where the A/C condenser is - loosen this. Don't forget to remove the perimeter nuts hidden between the kickpanel and the side of the ductwork. Remove the outer ductwork. The heater core is behind the inner, metal ductwork. To remove this, you have to basically remove the fan housing from under the hood. This is an overly complicated process. The simple way around this is to make small, diagonal cuts into the housing and fold back the edges until the heater can be removed. Reassemble in reverse.

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