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You disconnect the hoses. Then remove the heater core cover from the engine compartment (oblong black thing bolted to the firewall on your left hand side, looking in). Wrestle that off and extract the heater core...swap out your new core and replace it all. It is that easy. I put in a coolant flush kit while I had it apart...flush your coolant system every few months for nothing. Good luck

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18y ago
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Q: How do you replace the Heater Core in a 1992 GMC Vandura 2500?
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