Fixing hissing in dash – – – mode switch diaphragm
Removing center console procedure:
1. Remove 2 screws holding in dish in back of console. Remove dish.
2. Remove two bolts under dish.
3. Pull switches off A/C console. They pull right off.
4. Remove one screw holding in plate, remove plate.
5. Remove shift knob.
6. Unscrew the shift plate and pull up partly, work leather off of shift stick. Find something long as you need to pinch the pins located far toward the front of the shift plate, that secures it to the center console. Unplug rheostat switch.
7. Save yourself the pain next time and remove the two retaining metal clips so there is no problem reassembling or removing this next time. It is not really needed, as it does not move, is held down in the back, as well as the front.
8. Remove 4 bolts under shift plate.
9. Remove screws under passenger and driver side foot well, located towards the top corner, securing center console to dash.
10. Pull up on console and lift towards back, be careful not to pull wires out of the center switches.
Fixing mode switch:
Unscrew the mode switch from the center of the accessories dash. Stick your hand behind and unplug the three wires in it. Make sure you remember how they were plugged in. Remove rubber boot and pull switch out from behind dash. I found it easiest to do this from the passenger side, as there is more room to see in back.
Unscrew the plastic plate from the mode switch. Remove plate. Look at tabs holding in the white nub. Press together gently and remove the white nub, but do so with it against a table as the spring is forceful and if you only unhook one tab, the springs force will break the other. This is what happened to me. If you break a tab, do not worry, there is a fix. However, remove the rubber diaphragm now, place the new one in, and give it a quick going over with vasolene, but do so very fine so it is not on thick. Place back together. If you broke a tab, take the white nub and tilt it sideways so the tab section is hard to put in. This hole is a bit rectangular, and you can force it in the other way. This keeps pressure on the spring to hold the diaphragm in place. If needed, use some pliers but BE CAREFUL. If you break something further it is not my fault, this is simply the step I took to fix my earlier error.
Now, reinstall, reversing every step. No more vaccum hiss.