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How to Replace the Heater Core in a GMC Sierra Pickup

Model: GMC Sierra MK 1 - Years 1988-2002
Part: Heater core

In this tutorial, see how to replace the heater core in a GMC Sierra pickup. First, wait for the engine to cool completely, then open the hood, remove the air intake duct, and disconnect the two hoses connected to the heater core. Next, move inside the cabin, remove the cover located under the dashboard on the passenger side, and unscrew the 5 mounting bolts of the heater core using a 5.5mm socket wrench. Once removed, install the replacement by following the reverse procedure.

Updated on 27 June 2026 by ScegliAuto

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