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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∙ 9y agohow to replace a heater core in a 1997 Chevy blazer
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How do I replace the heater core in a Chevy express 1500
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Try this link it even has photos http://www.v6z24.com/howto/heatercore
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its leaking under the car around where the dash is
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.
help me preplace heater core in 92 Chevy van g20
Here is a link with pictures, tools needed and everything to do the job. http://www.v6z24.com/howto/heatercore