2000 alero dash The gauges, odometer and different warning lights flicker and jump all over. The car starts and everything else runs well. Thought it may have been the ignition but after changing the problem still persists. The temp gauge for example shows a high temp even when the car is turned off and the key is removed.

SOURCE: Dead battery or starter?

Take the battery out and have it charged up. reinstall it and you should be allright. Your car has discharged it completely, and it will need a recharge to start. The gauge is only measuring voltage, and not the status of charge.

SOURCE: 1997 Oldsmobile Aurora Outside Temp Gauge

the sensor is in behind the nosecone. but this should not effect the ac system . it would it the inside temp sender said that in the auto mode only. put it in defrost mode and the compressor should be on if not you have another problem (maybe low on freon)

SOURCE: All dash light and gauges

check your body control module

SOURCE: none of the instruments in

check the fuses

SOURCE: 2000 Alero hard to start

I had this problem with my 1999 alero i took it apart and investigated it myself because i have been a mechanic for 25 years now but i had to replace the starter relay the whole ignition system and believe it or not new valves. After I replaced all of those my alero drove better then eer and the lights never went back on or any of the other lights....