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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Try this link it even has photos http://www.v6z24.com/howto/heatercore
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Remove the water supply hoses from your 1985 Chevy heater core. Remove the heater core retaining bolts. The heater core will come out. Reverse the process to install your new heater core.
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Here is a link with pictures, tools needed and everything to do the job. http://www.v6z24.com/howto/heatercore