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You have to remove the entire dash board to get at the heater core. I think it's F***ing stupid the way car manufacturers do that when they could position it to come through the firewall, but that's the way it is. It's a serious pain to do and if you don't know what you're doing, take it to your friendly neighborhood mechanic and pay him to do it. If you insist on doing it yourself... go to the autoparts store and get the Haynes Manual, or Chilton book, and follow the instructions. They're too complicated and lengthy to record here. But from experience, fill the new heater core with water prior to installing it. I didn't the first time and had to redo it. It created an air pocket the antifreeze couldn't penetrate and it was in the dead of winter that I had to deal with it. Good luck!

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Q: How to replace a heater core on a 1983 mustang?
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