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1. Place the heater-A/C unit on a suitable work surface. 2. Locate and remove one retaining nut from the blend-air door pivot shaft. 3. To remove the top cover from the heater-A/C case, the crank arm must be removed. 4. Disconnect the vacuum lines from the defroster and panel mode vacuum actuators and position them out of the way. 5. Remove the 3 heater-A/C unit cover attaching screws, fastened upward at the defroster outlet chamber. 6. Remove the 2 heater-A/C unit cover attaching screws, fastened upward at the air inlet plenum. 7. Remove the 11 heater-A/C unit cover attaching screws, fastened downward into the housing. Then lift the cover from the heater-A/C unit. 8. Remove the old heater core from the case. To install: 9. Install the new heater core into the heater-A/C unit case in the same position as the the old one. 10. Place the cover onto the case and secure in place with the 11 retaining screws. 11. Install the 2 heater-A/C unit cover attaching screws in the air inlet plenum. 12. Install the 3 heater-A/C unit cover attaching screws in the defroster outlet chamber. 13. Attach the vacuum lines from the defroster and panel mode vacuum actuators to the heater-A/C unit case. 14. Install the crank arm and the retaining nut on the blend-air door pivot shaft. 15. Install the heater-A/C unit assembly into the vehicle.

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Q: How do you change the heater core in a 1991 Dodge Spirit 3.0 liter V6?
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