I just bought a 1992 BMW 525i does anyone know what the small red bbsize light is?

the light is located on the left of the steering wheel but on the right of the healight switch. It is alluminated sometimes. I also would like any ifo regarding the air condition it does not work, does it take freeon or the new stuff? My radio does not work either should I replaced the whole unit or try the code thing someone else was told about. (if you got ur radio to work let me know if the code makes it work) the cruise control doesnt work either the bmw service place did not know why. Oh and they said the computer couldn't talk to them that it would cost alot more for them to go deeper into the computer to find out what was wrong with the car. this really is a great car i love it i was only in the price range to buy junk anyway so i thought i would buy comfy junk it drives great but i really need air conditioning and i hope nothing goes wrong with it too soon i am takeing it into a local mechanic i know the bmw service is just too pricey when i am in school trying to live cheep.

I just bought a 1992 BMW 525i does anyone know what the small red bbsize light is?systemworks

On my 535i, the small BB sized light next to the headlight switch is for instrument light intensity. There is a knob just below the BB light that will adjust the instrument light intensity from bright to dim. The A/C unit should have a decal under hood indicating the refrigerant used and amount needed for a proper recharge. R-134 or Freon R-12. Many types of radios. Dealer's should have code numbers assigned to various radio makes. 4 or 5 digits. Fuses for Cruse Control. Computer has built-in diagnostic trouble shooting. RSVP.