Check your coolant level.
why does my 2002 chevy cavalier over heat after i change the thermostat and the water pump
thermostat
The "heat maker" is broken. :(
Muffler Heat Sheild
no
try looking at your resistor pack on the passsenger side lower the blower motor down and there is a heat coil and resistor in there
Exhaust components rust out over time due to weather and the heat from the vehicle. On a 2001 Chevy Cavalier, when the muffler strap rusts, welding a new strap in its place will offer a complete and reliable repair.
I'd check the coolant level first, then the thermostat.
$52- $208 roughly. depends on if the heater core is bad.
Low coolant? Bad thermostat? Heater core airbound, plugged or restricted? Water pump not circulating coolant?
Check your heat shield by the catalytic converter, and the strap around the muffler. The heat shield has a tendency to come loose, and the strap rusts on almost every 3rd gen cavalier I've ever seen
heat/ac actuator