First, take a socket wrench to remove the cover of the blower motor of a 1993 Chevy truck. Then pull the motor blower out and install a new one in its place. Lastly, screw the bolts of the blower motor cover back in.
You will have to replace it. The bearings are worn out in the blower motor.
The blower motor can be replaced on a 1995 Chevy truck by first disconnecting the battery. It helps to take a picture of the blower motor before dismantling, so that it can be put back easily. Disconnect all the wires from the motor, then remove the bolts holding it to the firewall. Replace with the new motor and bolt it in, then connect the wires. Reconnect the battery.
About 15 mins. That's a easy job.
The blower motor resistor pack is defective. Replace it.
In the truck!
The fusebox which controls the blower motor is under the hood up by the firewall.
The blower resistor on a 1999 Chevy truck Z1500 is located behind the glove compartment. There is also a resistor on the firewall next to the blower motor itself.
Remove the wiring harness from the back of the blower motor. Remove the blower motor retaining screws. Remove the fan from the blower motor. Reverse the process to install the new blower motor.
You gotta start by figuring out what's wrong with it. You need to determine if it's the blower motor itself, or the power supply, then troubleshoot to determine the exact cause.
behind the glove compartment, to the left
There could be two separate problems. Check the blower motor resister, and the ABS sensors for problems that could cause this.
1999 S10, it should be under the hood, on the firewall, on the passengers side, close to the blower motor.