How much its to repair blower rsistor motor on my 05 pontiac?

SOURCE: Daytime running light/blower motor interaction

I have the same problem. I've heard the ignition switch harness is shorting out and replacing the ignition switch ($75-$125 part) will fix it. A few torx drivers and sockets are needed to replace it (a 4mm hex socket works for the column covers, but the bolts holding the ignition switch in are even smaller. I have it apart down to where I need a smaller torx socket to continue.)

SOURCE: blower motor only works on high

located under dash next to blower motor itself should be a couple of wires plugged into it

SOURCE: Heater blower motor only works on high on 2002

THE BLOWER MOTOR RESITOR IS BAD.IF U HAVE RESITOR IT IS UNDER THE DASH ON THE PASSENGER SIDE AND HELD IN W/TWO SCREWS

SOURCE: heater blower motor only works on high

You most likely need to replace the ignition switch. Sounds weird, but check out other posts. It works.

SOURCE: how to replace AC Heater blower motor on a 2002

If youre changing it because it wont blow, try applying power to it first. It is on the passenger side under the dash if you take off the panel above the passenger feet. has a 2 wire plug in apply 12v to the motor, if it works replace the more common blower motor resistor which is located 3-5inches towards the front of the car from the fan itself. Also be sure to check your fuses.