Rear A/C not blowing on 1 or 2. Overhead rear a/c panel dim in middle.

[TDalRN]

I have a 2006 Tahoe. The rear air control is manual and overhead by the rearview mirror. It will randomly decide to blow when dialed on 1 or 2 and works great on 3. It blows hot and cold fine and switches from the different positions fine (face only/foot only). When driving at night I noticed the middle of the overhead control panel is dim and the outer part is brighter. I don't know if I need to replace a part in the overhead panel or the blower motor or resistor in the rear panel. I have looked all over online and can't find any answers. The usual problem for people is the front dial not the rear. My front air works great.

 

[TDalRN]

I'll update on my own account for anyone else having the same problem since no one else commented. I fixed this myself. The 2006 Tahoe in the rear has a resistor relay: ACDelco 15-8961 GM Original Equipment Multi-Purpose Relay. I was able to pop off the panel and switch it out within half an hour. Only tools needed were a 7mm socket and a phillips screwdriver. There are youtube video's that show how to take the panel off. The part through the dealer would have been $123 but I got it on Amazon for $59. As for the dim light in the middle of my overhead console, it isn't related and must just be a bulb burnt out. Rear air works perfect now!