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2003 Chevrolet Astro blower switch doesn't work

my blower switch on the heater controls not working. replaced control unit in the dash. still blower won’t come on. replaced blower motor. and resistor last year. ???

Are you uncertain that the blower motor and resistor were replaced?

I have seen where a blower motor has bad bearings and this causes the resistor pack to burn out prematurely.

Even though the blower was replaced, you may have gotten a bad one.

You will have to test the blower by jumping from a known hot lead to check if it is even working.

Yosemite

How 'bout the fuse?

Tester