Battery went dead in 19 degree temp. Jump started

double posted, why?
JUMPS OK
AFTER JUMP WORKS AND DRIVING, AND STOP AND KEY OFF
IT WILL NOT CRANK.
did i guess right?
that means ,
check all fuses first. even the alt fuse (large)
1-battery bad? #1 top failure all cars.
2-Charge system bad. (is the charge/ batt warn lamp glowing when running car, bingo.????

3-or phantom drains. (if no crank just after stall then it not this) if drains while sleeping yes.

the tests are easy, a dirt cheap voltmeter
13.3v to 15v running is good charge system.
if 12v and falling not.

if the battery is bad, the charge system can shut down, so, the best practice is to try a know
good battery out of 2nd car, do you have battery to barrow, this is TOP CHOICE< not thinner wallet.

if the good battery fails then the charge system is failing (note I said system and not a part)
or the belt missing or slipping to the alternator.

btw the 4.3L PCM runs the alternator
PCM is engine brain.
btww, same true 2.2l engine.
the regulator is in the PCM.

so is the charge/bat lamp in cluster
on key on, lamp test
the jump start it , it runs
does the charge./batt.lamp go out.
id be all over that lamp, costs nothing to look.

take the air temp sensor off. and leave in warm house. till at your homes warm temp then go out and install the sensor.and start engine. if it starts this is your problem.

Not supposed to jump VWs. Sounds like your immobilizer kicked in. You have to connect to a diagnostic tester and clear the errors before its gona start. Go see how to do it on http://volkswagen-polo-highline.blogspot.com

1. Check n clean battery cables with a battery brush. Look at both ends, if able.
2. Check battery acid level. Add if needed, get a jump.
3. All OK? Then get a battery load-test done free at a parts store.

18 degrees in September? Isn't that Celsius?

The voltmeter should only go as high as 14-15 volts when the engine is running. I would check for a poor connection between the battery and starter.

200 degrees is not hot; the radiator cooling fan shouldn't even come on until 210 degrees.

Your description sounds like a dead battery. Can you jump start it? If yes and runs normal then most likely you have a dead battery. If you can start it, any chain autoparts store will check it for free.

Reboot - just disconnect the battery + cable for a few minutes and reconnect. This should restore all default settings.

You need to Check out the Alternator.

The main problem could be a well known cobalt ignition issue. check all fuses, wires, and connections if you've worked on cars before and call to see if you still have any warranty left. This should be handled by a chevy dealer or chevy trained mechanic...to isolate the issue fast and avoid repeat visits to get er done.