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No repairing those blower motors, replace it with a new one.
Need to know the model year Chevy S10.
Ain't no fixin it, you have to replace it with a new one.
Under the hood, passenger side firewall, not far from the blower motor.
If you have no blower speeds at all check the fuse, then check the blower motor switch and electrical plug for a melt down situation, then check the blower motor itself.
Probably the blower motor resistor is shot.
The blower motor high speed relay is located under the hood, on the passenger side firewall close to the blower motor. The blower motor speed resistor is also located in that same area.
Check to see if it is getting power - if so replace motor - if not check fuse, relays and switch
Should be under the hood, on the firewall, passenger side, not far from the blower motor.
You didn't say what year but my 2002 S10 Blazer has the HVAC blower motor resistor located under the hood, on the firewall, passenger side, close to the blower motor. Unplug the wire harness and remove the two small screws holding it in place and gently pull it out.
Locate the resistor under the hood near the blower motor on passenger side firewall. Unplug the electrical connector. Remove the screws holding the resistor in place. Remove the resistor. Install in reverse order.
Not knowing what year S10 you have, you can generally find the blower motor high speed relay nearby the blower motor on the firewall. The resister for the other lower speeds is also found close by the blower motor.