WOW, sorry it has taken so long for someone to see and respond to your question. You've probably figured it out on your own by now, but if not, here is your answer. The heater core in your Caprice is located behind the glove box. To gain access, you have to remove the lower right dash insulator panel (below the glove box) and than the glove box. Remove any vaccuum lines ( mark their locations.) Then remove the lower instrument panel brace and then the heater core cover. Remove the heater core clamp bolt and clamp. Disconnect the heater hoses from the heater core on the left hand side of the engine compartment( looking at the engine from the front of the car.) Then remove the heater core.
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