How do you change the heater blower motor resistor.How do I get to it. on 2000 Chevrolet Malibu

Blower motor only works on 3,4 and 5. I assume its the resistor. Not sure how to get to it. Also when I push button for inside air it comes on then jumps back to out side air by its self. Half to push it 3 or 4 times before it stays.

Asked by for the 2000 Chevrolet Malibu
under the right side of the dash. very tight. held by 3 7mm bolts and a wire connector.
can buy it at any parts store.
the other issue needs a switch from your description.