Try this link it even has photos http://www.v6z24.com/howto/heatercore
Detach the screw that attaches the heater duct on a Chevy Cavalier and remove the heater core. Once this is done you can replace the faulty heater core with a functional one.
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There are heater-resistance wires in the glass of the back windshield.
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Here is a link with pictures, tools needed and everything to do the job. http://www.v6z24.com/howto/heatercore
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