Usually when this happens it is the resistor on the blower motor assembly. Most auto parts stores carry them for a fair price (usually less than $50), and usually they can be put on without too much trouble. First, find your blower assembly inside the cabin ( usually near passenger floor). Next find the 2 plugs going to it. One plug will be attached to the resister. Unplug the harness, replace the resister, and reinstall the blower housing along with any panels that had to be removed to facilitate the repair. The resister just meters the amount of voltage to the blower motor so it's not running wide open all the time. Hope this helps.
You need to replace the blower resistor module under the dash passenger side. VERY common problem with GM.
Check the voltage at the blower motor plug and go through all the speeds. If the voltage does not change... it is probably a bad switch
Your blower resistor has failed. It will only give you high speed when it has. It's either on top your hvac box behind glovebox or on engine side of firewall. In hvac
SOURCE: blower speed
you need to replace the blower risistor. it should be located very close to the blower motor. it usually has 3 wires that are in a row and one wire a little to the left of it but located on the same oval fixture. go to the auto parts place and buy one . this way you will no exactly what it looks like so you do not have to spend a lot of time and money researching it.
SOURCE: my 1998 astro van blower motor only works on high speed.
No the motor is not bad or going bad, the heater blower motor resister is bad, thats regulates the blower speeds, its located under dash by heater motor 2 screws hold in heater box with a electrical plug to it.
SOURCE: ac blower motor
you need to replace the blower motor resistor assembly try this website www.autozone.com if they do you be able to checkout a price and get pictures and diagrams for the most part its on the passenager side behind the glove box i also would like to give you this information if you every have any hard to find GM-parts its Schram auto & truck parts 1-800-292-1032 and they website is www.schramauto.com and i hope i have been some help to you Michigan Man.
SOURCE: Blower motor on works on high speed
Also, I'm having the same problem, kinda. My blower doesn't work on any speed. It worked fine before, but now it doesn't.
However, it's not a hard fix. Here's a link to a site with a write-up on how to replace the resistor pack as well as the wiring harness: http://www.355nation.net/forum/how-tutorials-reviews-service-bulletins/6401-how-hvac-fan-motor-resistor-connector-replacement.html
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
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