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Locate the heater hoses in the engine compartment, follow them back to the fire wall, unhook both hoses at the firewall. The core is on the inside of the cab right behind where you unhooked the hoses. You will have to remove most of the lower dash board and the heater air box to access it. Not a very hard job, just a lot of BS to remove to get to it.

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Q: How do you remove a heater core from a 1987 Chevy Blazer S10 2.8?
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