its under the passenger dash facing up there are 3 bolts to take out and un plug it then take it straight down re place s the opposit but mine did not have the sam plug on the wiring so i had to crimp splice them back together
Pull the blower motor out and check both the motor, the blower wheel and the housing for any trash that may be stuck in it................
The blower motor resistor pack is probably malfunctioning. Replacement is fairly easy and fairly inexpensive.
on the blower houseing beside the blower motor
Blown fuse, bad blower motor switch, blower motor itself, or a defective blower motor resistor pack.
The blower motor is drawing to many amps, replace the blower motor.
Buy a Chilton's repair book.
The front blower should have a resister to change the speeds. It is usually mounted close to or on the back of the blower motor.
below the glovebox
Unscrew it.
Remove the wiring harness from the back of your 1999 Chevy Monte Carlo blower motor. Remove the blower motor retaining bolts. Remove the fan on the front of the blower motor. Reverse the process to install the new blower motor.
99% of the time, the blower motor relay, or resistor block,will be bad if the fan motor only works on high speed.
Check the following................ 1. Power and ground to the blower motor. 2. Blower resister. 3. Blower switch.