Passenger side, on the firewall, there's a large plastic housing for the heater fan assembly.. there are a couple of small screws (3, if I remember right) holding a small (roughly 3" square" plate on top of that housing.. the resistor is under that plate. It's somewhat towards the center of the engine bay, and the back screw is a pain to get out, you'll want a ratcheting wrench or a swivel adapter for the socket wrench.
You didn't mention what year S10 Blazer you have but, the blower motor speed resistor can be found under the hood, on the passenger side of the firewall, close to the blower motor.
Should be behind the glove box. The blower motor speed resistor is located under the hood, on the firewall, passenger side, close to the blower motor.
The blower resistor gets overheated and burns out usually because the blower motor is failing also.
where is the blower motor on a 2001 chevy blazer
They get noisy, squeal and vibrate. Also if you keep burning out the blower motor resistor, that is a sign the blower motor is on its way out.
Under the hood, passengers side firewall, close to the blower motor.
The rear blower motor resistor location for a 2003 Chevy Trailblazer Ext LT is beneath the passenger side of the dash.
probably the blower motor resistor
The fuse. The blower motor speed resistor. The blower motor relay. The blower motor switch. Check for power at the blower motor connection.
Under the hood, on the firewall, passenger side, close to the blower motor. If the blower motor resistor is burned out, you should still have the high speed function.
how to change the blower motor
Under the hood, on the passenger side of firewall, near the blower motor.