Looks like a piece of cake. Check out the following link: http://www.automotiveforums.com/vbulletin/t490722.html Its a how-to with pictures.
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.
how do you change a thermostat sensor in a 2001 Chevy cavalier and where is it
copy link and paste... http://www.v6z24.com/howto/heatercore
There are heater-resistance wires in the glass of the back windshield.
to change 2000 Chevy cavalier a/c evaporatorto fix it
how to i put it at on the Chevy cavalier 2.2 l
The heater fan is located under the dash on the passenger side
how do i change a heater core on a 2000 Chevy impalla
Remove the wiring harness from the back of your 2005 Chevy Cavalier heater blower motor. Remove the heater blower motor retaining bolts. Remove the heater blower fan.
its leaking under the car around where the dash is
Instructions on how to change the rear hub wheel bearings on a 1996 Chevy cavalier
i have 85 cavalier how you get key cycliner out