02 z71 tahoe

I lost the ability to change the amount of air for my front hvac system. I can only use setting 4 (123&5 do not work). I changed out the in-line resistor and still only setting 4 works. The blower seems to be working and i tested the switch (which is mechanical) and that seems to work fine too.... Any ideas before I take it to the $dealer for out of warranty work? Fuses, grounds or something easy????

Thanks its starting to get cold up here....
ben-

 

They didnt get to in depth with me when mine went out. They simply said that it was a bad relay. I dont know where or which one, but it was a relay.

 

Thanks for the hint. I will call and see what the dealer has for relays and order them. I will post the part numbers and the fix if it works.

ben

 

Well did you fix it ??? If so let me know cause on my way home today I was backing in and noticed no air was blowing and mine only blows on 3,4, & 5. No 1 or 2. I stumbled across this thread after searching for a post that I remember looking at a while back...Zed