Ive thought about doing this myself, except I then took apart my mom's clustur and realized that the bulbs were plain bulbs, its the plastic that conveys the light to the speedo and all must be colored or something, cuz mine shines with a slight green-ness to it. I dunno, its only 5 screws to do so maybe Ill do it one day.
As for the AC, my handy dandy Mr. Helm Book says that there are 7 LED's, yes LED's and 2 bulbs in the HEATER/AC control panel. I would assume that the LED's are soldered in, since the life of the LED is about 10 times the life expectancy of the car. The service manul doesnt show how or where they are, just a circut diagram. Good luck and tell me how the spedo bulb change goes.
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