Heater blower motor stop working. found resister was shot.[ replaced it ] now fan runs on 1 -2-3-4- but not on 5 which is high speed. that should be pretty much be direct power. I changed out resister 2 more times so I used 3 different resisters total and still not working on hight speed.. This problem is on a 2003 monte carlo ss

SOURCE: Blower motor or resistor?

Yes its the blower motor resistor.

More then likley theres some trash or something in it, or possibly the motor itself is on it's way out. There not that bad to pull out of that body car, just pull it out and see what you can see.

The blower motor is under the glove compartment

You can replace the resistor on your own. Please find a detailed diagram which would guide you to do it.

http://autorepair.about.com/library/images/bl629a-lib.htm

Thanks

SOURCE: blower motor on my 2003 silverado 2500 only works at high speed I was told it may be the resister If this is true where can I find the resister on my truck THANKS

Chanses are its the resister, it should be located by the heater motor, most are above heater box behind glove box.

SOURCE: Blower motor or resistor?

I had a truck about the same year with the same problem, it was the wiring harness, but id check the resistor and the fan first before replacing anythings,

SOURCE: 2003 Monte Carlo SS Hesitates and Dies after running for awhile

The ck engine light should not be ignored, what sensor was shown to be bad ? Have it scanned again and replace the sensor that is bad if it still runs rough you might want to consider a tune up. Plugs, wires, fuel and air filter's and clean the throttle body with some gumout. It could also be the IAC motor Idle Air Control. Good Luck

SOURCE: THE A/C BLOWER MOTOR ONLY RUNS ON HIGH SPEED, THE

could be one of two problems either the switch for the fan motor or the motor itself u would need a 12volt test light to check ground one side light and touch the switch connector wires one by one until light comes on this is the main line then turn switch to the 1st speed u should get a light on another wire if switch is working repete for all speed selection if it works then the motor is bad