needing some a/c tech help

[jason22]

MY a/c is only blowing out of defrost, it started when the battery died and had to be replaced. I have read that this can somtimes can be resolved by disconnecting the battery again and letting it reset or by taking the HVAC fuse out and letting it reset. I have done both of these to no avail, but when I take the HVAC fuse out the blower then will begin blowing out the vents properly but when the fuse is replaced it goes back to blowing only out the defrost. This is on a 2003 GMC Yukon and it does have digital with dual climate contol. Thanks in advance (it happened once before and ws a simple fix for my mechanic but it's frday night and i can't go see him lol