Blower only works on level 1, 2 and 3

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 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: Blower motor now only works in 5th speed, 1 to 4 not working

You are going to have to make a connector for your resistor to fit into the adapater under the dash. the new resistor doesnt reach the terminals on the connector. Even though it clips in place it doesnt reach. I took a piece of small soldier and put in the connector then plugged it in and it worked just fine. When you unplug the relay it will not work in any speed.

SOURCE: 2005 Chevy Surban blower motor resistor

mine did the same thing. It was the gears breaking off in the resistor. However, the wiring harness and resistor melted inside of the dashboard AND DID NOT trigger the fuse... causing a safety issue. This was this past month. I notified GM and the National Highway Traffic Saftely Administration hotline located in the owners manual. They are not tracking this problem to see about safety recall. If you have this issue, you need to ntify them as well at their toll free number

Ronny Bennett Sr.

• 6988 Answers
• Posted on Nov 08, 2009

SOURCE: Changing a blower motor resistor

There is two screws holding it in,unplug the resister,and remove the screws,pull it out,