The heating and a/c does not work in my car what could be the problem? on 2005 Chevrolet Cobalt

I changed the blower motor resistor. But the switch to control the temperature still doesn't work but I also did some research and it said it could be the blower motor itself. Any ideas on how to find out what the problem is?

1 answer
IT COULDB BE MANY ISSUES SEEK DIAG AND EST TO BE SURE