Not familiar with diagnosis on your particular model, but did these symptoms occur simultaneously, or are these unrelated issues that cropped up at different times?
I would check fuses first if these are related problems...
Otherwise, what does the volt lite symbol indicator look like? Sounds more like the brake pad sensor to me.
Also, a bad oil level sender can give false readings, but more specifically, the connector to the sender degrades over time.
No clue on the A/C controls...I'm a total moron when it comes to climate control systems...
