'01 Yukon XL Heater A/C fan switch

Air and heat blow but only when set to 4 or 5 on the control dial. 1,2 and 3 do nothing at all. I just finished replacing the control module and I am still having the same issue. Is there a low speed and a high speed fuse for the system that I am not aware of? Anything else I am missing here. I am at a loss as to what might be happening.

Thanks!!
Gordie
:Chevy:

Picking up a blower motor resistor in the morning. Guy at AutoZone thought that would solve the problem. Now I just need to figure out where the bugger is located and figure out how to get to it.

$25 bucks and 20 minutes. All is working fine now. Easy cheap repair. :thumbsup:

Now... anyone want to buy a heater-A/C in-dash control unit? Seems I have an extra one now.