A/C worked fine yesterday, today, blower (fan) is not working?

Hello,

An inoperative blower fan can be due to a faulty switch, bad relay, malfunctioning blower motor resistor, bad motor or wiring issue.

First check the relay.
The blower motor relay is located under the hood (see diagram).
Check for any corrosion or burnt pin(s).
You can also test the relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If the relay is good, then make sure the blower motor is getting power. To see if the motor is good or bad you can test it by simply applying 12V power to it.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

I have attached diagrams for your reference.

Let me know what you find or if you have any questions.
Thank you.