More then likely the switch is bad. This is one of the most common failures, even if all the other switches work, doesn't mean that one switch couldn't be bad. Start testing power is you can
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_677dced97ad9bddf
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: I have a 2005 chevy
Treed55508,
Try this solution. I have had the same issue three times. A Chevy tech told me that if it keeps doing it, to replace the blower motor, as it seems to be a chronic problem with the blower having to much resistance and thus burning out the resistors. I suspect that you probably had lost one speed first and then more. It has happened both ways with me, once the entire thing went out at once and then the other times it goes one speed at a time.
http://sparkysanswers.blogspot.com/2008/07/2005-chevrolet-silverado-blower-inop.html
SOURCE: Heater/ac switch speeds 1 and 2 don not work in 99 Silverado
you need a resister found under your air duct by the passenger floor under dash board auto zone sells these for about 25.00 you may as well buy cabin air filters while your at it . 1 of the screws will be a pain to install back into the duct work I left mine out didn,t make a difference . you might have to order it as they are a comman item oh you will need a vacuum to clean up mess from cabin air filters .this is not a hard job .
SOURCE: 2003 Silverado ac/heat blower does not work
yes make sure all the wires are off the blower motor and jump it to give it 12 volts if the blower works the problem is else ware. get back to me if you need more help,please don't leave bad rating get back to me and we'll go from there
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