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first you need to lift the hood and remove the two hoses from the back of the fire wall where the hoses are located. after you need to look under the dash board inside the car and remove all the screws and cover and then you will see the heater core. And the reverse will be the same. It will take a couple of hours no more than 3 hrs.

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Q: How do you replace A heater core on a 1987 Chevy full size Blazer?
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