Where is the starter located on a 2007 Chevy Impala? It just clicks when I turn it on and lights barely turn on and the air will turn on only when trying to jump the battery. Engine didn't turn on even with a jump

Check the battery like this:
Turn on the headlights, then try to start the car.
If the headlights do not dim or go out, then the battery is likely ok.
Check that the battery cable plus post, goes to the starter, Minus post to a good ground, like the engine.
If wiring is ok, then look at the starter solenoid for a good connection.
Problem is most likely the Solenoid or starting relay, whichever the car uses.
Hope this helps.

Start by checking the battery voltage, while doing nothing and while you try to start your engine
a good battery should read over 12 volts
when cranking the engine it should not drop to less than 9 volts cold and 10 volts warm
if battery is good
check all the electrical connections very well

if no problems are found, replace your starter
it is right next to your oil filter on the 07 impala

Get a meter and check the battery, even with jumper cables a really dead battery could be the problem