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There are three fuses involved, all of which are in the fuse box in the dash.
15amp radio hvac powers the control module on the dash.
10amp hvac also powers the module.
30amp high blower fuse powers the blower motor only.
Check your owners manual for details.
check fuses and relays if not that inspect wireing to blower motor test power going to harness to blower motor if you have power blower motor bad if you dont have power its in your wireing hope its only your fuse or relay good luck
The rain had nothing to do with it. What ever GM told you was a quess,unless they worked on it. You never change parts until you know their bad. Have to at least know how to test relay, if you do find it. Stop by dealer,they will come out and remove it for free
Start simple and check the fuse. If you can run the fan on certain speeds but not others, it is most likely the resistor. If the fuse is good but it wont run on any speeds, look at the relay (this component is first in the circuit. If all components turn out to be fine, look lastly to your blower speed control knob.