Did you install a non factory radio? If so you found the problem.
SOURCE: my 2002 chevy malibu's temperature gauge, fuel
It is a blown fuse. Check your manual and you will find there is one fuse that takes care of all of these things.
SOURCE: digital heater countrol and fuel gauge not working
i had the same problem in my 91 deville but the fuel gauge was intermittent at first, working most of the time then eventually it quit working all together, i also replaced my ignition switch thinking that was the issue but what actually happened is the fuel gauge shorted out the 16 volt supply from the bcm (body control module) which also feeds the ac and in my case the digital speedometer. your speedo probably isnt digital, but if you unplug the fuel gauge from the harness your ac gauge should come back on or vise versus unplug your ac and the fuel gauge should come back on right now im trying to locate fuel gauge. i hope this info is helpful to you, all you need to remove the gauge is 1/4 inch drive rachet and 7mm socket and a phillips screwdriver (#1) for the trim
SOURCE: 2001 cadillac deville theft lock on after replaced battery help!
IF when you purchased your car you didn't set your own personal code you will have to take this to your local GM dealer and they can pull the code that is set at the factory and unlock your radio.THe proceedure for setting your own code then unlocking radio is in your owners manual.The dealership I worked for did this for free.
SOURCE: how do i reset my radio in a 2002 cadillac
check owners manual, youmay have to reprogramthe radio,
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