Air condition and heat won't come on

Hello, First thing to do is to check the fuse for the blower motor. It may have blown. Also, the blower motor may have failed, the relay may have failed, or the blower motor resistor may have failed. Try the highest fan speed before you do anything else. Many manufacturers send direct power at the highest fan speed, so turning the air all the way up may show that you have a bad blower motor resistor.