Oldsmobile Alero Electrical/Heat issue?

it could be something as simple as a corroded positive battery terminal, the two cables that run to the side post battery are stacked on top of each other and have a tendency to corrode which cuts down on the electrical flow to your starter and computer controls. although it could be much worse olds alero's aren't very well built cars and you have a lot of miles and years on your car. you may be at the cutoff point where it will cost more to fix the car than its worth. you need to take this into consideration if you're looking at spending a lot of money on an old piece of junk.