My heater and ac blower quit working. checked the fuses and all are good. where should I go next?

You could check for power and ground at the blower motor or you could leave the blower in the on position and bump the blower motor with a screw driver handle. If the blower starts working, it would mean the brushes in the blower motor are worn and that you should replace it..

Look for your blower speed control switch, usually located in your blower fan housing to keep it cool you can usually tell when you see it ,if it burnt out. or do a continuity test.