Probably the resistor it may have even melted wire I think you can get it fixed free at the dealership some have a recall
Most likely resistor before you assume its bad make sure it has come loose my friends silverado fan speed five stopped workink and an actuator syarted clicking i checked the plug in to the resistor slightly loose i disconected it and plugged it right back in everything is back to normal so he ended up returning the resistor and it hasnt had another issue since last week. If that doesnt fix take it out and and take it apart look for burnt parts on wiring circuts etc. If so replace it.
There is a recall on the blower motor wiring.
Very common issue with those! Most likely will need a blower motor resistor at the least and possible resistor pig tail. They get hot and melt the ends causing a bad connection. If not going to dealer be sure to take bad resistor with you because there are two different styles that look similar until you go to bolt it back up. If replacing the pig tail replace one wire at a time so you do not cross wire it.
SOURCE: 02 GMC Sierra-heater-a/c motor only works on high speed
Check or have checked the blower motor resistor. These resistors will cause this problem. I would go this route first as these are relatively inexpensive and usually the problem.
SOURCE: how to find what is wrong with a blower motor on a
replace the resistor pack near the fan motor.
SOURCE: GMC Safari 2000 blower motor works only on high speed. how can i
you ahould be able to purchase that at any parts store. they are easy to install
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