Blower motor not working

This is one of the many problems with GM cars, down with GM with its car problems typical to cavalier.
If the motor works at max speed, then it is not the motor itself, it is, and I was told that there is a small piece of PCB hidden inside the console right next to the motor. And I learnt and removed it from the harness, replaced it by hi-wattage wire-wound resisters, and yet, they blown three times on all gangs (speeds) and finally all the speed selector contacts. 'cause the motor draws a lot of electricity current, and the design is bad! While hi-wattage wire-wound resistors cannot stand it, imagine how come the flimsy wires and printed foils on PCB can?
It is a badly car built with bad components!

Electrical problem
1993 Chevrolet Cavalier four cylinder two wheel drive automatic 80,000 miles.

Recently the fan went out but we tried to re wire to my shut off switch that have because the ignition switch went out. That is the purpose of the shut off switch being on there. It was on for awhile but stop working. Does the fan always come on when you start the car? Also, if fuse needs to be replaced were is it located how can I tell it is blown? Because my car overheats and all the fluids seem to be good and pump seems also to be working.

I have a Chevrolet Cavalier 1997 with 51,578 miles and it has a 2.2. The problem is the blower will only work on high and medium high it will not work on low and medium low. I installed a new blower that was not the problem. I replaced the heater and A/C switch on the cluster with the other knobs and that did not work either. What is my next step?

Heater problem
1997 Chevrolet Cavalier four cylinder front wheel drive automatic 113,000 miles.

My fan blower for defrost and heater not working.