I am currently replacing my cluster bulbs with LEDs as well as my radio and such. Unfortunately I cannot find the bulb size for the A/C control unit. There should be two identical bulbs. Its a 1997 Ram 1500. Also I need to know how to take apart the fog lamp switch and the o/d off switch so that I can replace those bulbs as well. Does anyone know how to take the actual switches apart, and if so, what size bulb is that?

 

I don't think the switches are serviceable. You might be able to get them apart, but, putting them back together and actually having them work might be challenging.

There are parts manuals in the FAQ section, they can be a bit interesting to navigate, but, if there is a part number for those bulbs, you should find it in there.

 

Not sure since yours is a 97, I have mine done and just used some 5mm prewired LEDs, just wired them into the stock bases.