Well I just introduced myself so now I need your help PLEASE!!!! My 1999 GMC Sierra has been having blower problems for a while now and don't know where to find the blower fan relay and the blower motor resistor. It is a 5.3 automatic and we just changed the blower motor switch cause the fan will only work from settings 3-5 we cannot use 1 or 2 setting, and yes there is air in the truck too. Can someone please be kind enough to help me locate these two parts!! Thanks in advance!!