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The entire dash must be removed. There are visible screws inside the cab and then there are more fasteners on the firewall side. It is a very difficult process. I bought a core from a local business and after struggling with it for about a week I took the truck in and had it done. It isn't an easy job. There are a few sites on the net with pictures of the process but I can't find them right now.

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Q: How do you change heater core in 1992 GMC Sonoma?
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