SOURCE: Blower motor or resistor?
If it was the motor that went out then it would not blow at all. The resistor is the culprit that starts killing off speeds. It should be about $25 to $30 at an aftermarket store like autozone or advanced auto parts.
SOURCE: 1998 chevy blazer
check the fuse box under the hood and look for a burnt fuse (30A mini)
mine had the same problem and I check the fuses, found one that was blown,replaced fuse, now I have #4 position working
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,
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HVAC Blower Motor Resistor, only $25-30
On firewall, by blower motor! Easy fix!
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