I got a hair up my ass today and decided to see what a 720 hides behind it's slightly cracked dashboard and faux wood trim. I looked in the service manual and it said that it could be done in nine steps. Seems easy enough. The first steps were; package tray, steering column cover, cluster and all of its fun quirks (like the complete lack of slack in the speedo cable). Removing the eight screws holding the dash in place was fairly easy (except for having to use the smallest socket extension even to get the ones next to the windshield). The struggle was getting the cables from behind the radio disconnected. I had to resort to two pairs of needle nose pliers to get them apart, and it took me about ten minutes to figure out how to take apart the cigarette lighter. After all that was done, I hauled the dash out and disconnected the (I assume to be) antenna cable, as well as all of the HVAC stuff, which was the real reason why I was in there: I wanted to clean out the pipes and seal any leaks.
I've thought for a while that my truck did not have the greatest blower motor, but I had a sneaking suspicion that I had leaks as well. Turns out a did, as the AC and heater had disconnected and was causing a fairly sizeable amount of loss from the blower. A little duct tape fixed that:
Once that was done, I cleaned out all of the pipes with warm soapy water, and let everything air dry for a while. I adjusted the doors in the system as well so that they closed tighter when moving the switch; I think that will help a bit as well.
Once everything was adjusted and cleaned, I went ahead and put everything back together. Putting the dash back in was a little bit harder than taking it out; getting the pipes to line up was the hardest. Getting all of the wires for the radio reconnected was a pain too, especially the long connector that holds a resistor of some sort. Once everything was back into place, the rest of the assembly was pretty straight forward (mostly because this was my fourth time taking the cluster out of my truck since I've owned it). Overall, I thought this was a good learning experience and some insight into how the lomb sits back there; this experiment will be useful when I install a new head unit or speakers in the future. For now, I will just enjoy my nice AC that smells like Dawn.
Also, does anyone know what this blue wire is for? It is located under the steering column, and is wrapped around the ignition wires.