It is under the dash where the passagers feet go.
Yes, located in the blower motor resistor pack. Follow the wires backward from the blower motor to find it.
the blower motor relay is located next to the blower motor it is connected to the motor by a purple and black wires
In the truck!
Pass side firewall.
Under the hood, passenger side firewall, not far from the blower motor.
Replace shoes brake 2003 Chevy
under the dash on the passenger side.
Heater core leaking?
The Chevy SBC 5.7L 350cid V8 was the standard
Most likely the Blower Motor Resistor.
It is located on the passenger side below the dash. A 7-wire harness goes to it. It is next to the blower motor, which is circular in shape.
In the fan box behind the glove box.