.4 with a/c add .1 if equipped with hush panels
Under the dash on the passenger side you will find the resistor. Remove the two screws and pull out the assembly. Unplug the old resistor and replace. Very simple repair.
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.
The blower motor speed resistor is burned out. The resistor is located close to the blower motor and is easy to change. Your local auto parts store will have that part for you.
Disconnect the electrical plug, remove the two small screws holding it in place then remove the resistor.
In a 1988 Chevy 2500, the blower motor resistor can be found on the passenger side. It usually is behind the glove box.
First locate the resistor, it is under the hood, on the firewall, passenger side, close to the blower motor. Unplug the wire connection and remove the three small screws holding it in place, then remove the resistor.
The blower resistor gets overheated and burns out usually because the blower motor is failing also.
In the truck!
Right next to the blower motor
The blower resistor controls the speeds of the blower motor Hi-resistance lower motor speed Lo-resistance higher motor speed
Blower resistor is behind the blower motor up against the firewall you can see wires hanging down from it. (Mite be called blower control module in 2005 models.)
There is a removeable panel below the glovebox. It is in front of the blower motor against the firewall. It has a wire connector from the loom and then it plugs into the blower motor