If yourtalking about the heater blower, I believe they are hidden behind the glove box inner liner.
Replace shoes brake 2003 Chevy
Most likely the Blower Motor Resistor.
This is typically caused by a bad resistor. Could be the switch itself, but it's usually the resistor.
Its not the relay, it is the blower motor resistor.
Yes, located in the blower motor resistor pack. Follow the wires backward from the blower motor to find it.
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.
you have to remove the glovebox, its behind that, it has 2 bolts and a "connector", should be on the left side of the blower housing.
Right next to the blower motor
On 03 silverados i belive the blower motor relay is internal to the blower motor resistor. i could be wrong though, check the underhood fuse/relay panel for one.
I think the blower motor relay is internal to the blower motor resistor which is located under the passenger side dash.
In a 1988 Chevy 2500, the blower motor resistor can be found on the passenger side. It usually is behind the glove box.
The blower resistor controls the speeds of the blower motor Hi-resistance lower motor speed Lo-resistance higher motor speed