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If it aint broke, don't replace it
Ridgerunner has got the right solution but before you go out and purchase a new heater core, inspect the two plastic fittings directly connected to the heater core for cracks. You might be able to salvage the heater core by flushing it thoroughly of any debris that might be blocking its internal plumbing. Tap the side of it lightly with a mallet to aid in this process (Warning: Do not tap on the fragile metal fins. Tap only on the plastic) . Than go buy a new plastic fitting and install it.
P.S. I'm in the process of doing the same procedure on my 93 Chevy Cavalier right now. I'm going to the parts store to buy a new fitting after I'm finished typing. Hope this was helpful.
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