I've searched on the forum and only saw a post for a single zone climate control with the illustrations on where it is...does anyone know or can someone post up the writeup for replacing the blend door actuator for a 2004 Chevy Tahoe, Manual Dual Zone Climate Control...thanks in advance. ( I tried looking up the part and saw a main and an aux actuator, anyone know which the drivers side would be?) Thanks in advance for the help...