My check engine light came on and now my car has been dead two days in a row. I can get it to start by jumping it so I was thinking my alternator is going out. How do I replace it? Also a sep issue, my rear defrost has not worked in the last year. This seems to be the only thing in the car that does not work (at least when it starts).
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Weak connection between battery post and cable. Since the jumper cables bypass this, by clipping on the cable ends, the car will start with a jump. Takes less current to start a warm car than a cold one, hence it starts all day. I would look closely at the cable ends where they attach to the battery. Clean them until spotless with baking soda and water and terminal cleaner brush.
If this does not solve the problem, clean the chassis ground on the other end of the - battery cable and + cable where it connects to the starter.
Check your alternator output also. Battery should not be defective in 2 years.
Possible current drain when key is off. Put a voltmeter inline with the battery and check for draw. If you get more than a few millivolts something is on and drawing current. Glove box light maybe? Check by pulling fuses until you find the source of the draw.
Is the security light on or flashing ? The yellow wire goes from the key switch to the neutral safety switch, then to the starter. So bypassing the neutral safety would make the starter crank the engine, but would have nothing to do with the rest of the engine.
you PCM has spot a problem in the engine control system.you have bad sensor or EVAP leak or cylinder misfire.any auto parts store will code scan vechicle see what cause check engine light to flash on.they will code scan vechicle free go by auto zone.
the 'no lights' part makes me think it could be a bad ground -- follow the ground cable from the battery where it should connect with the chassis then continue on the the engine itself -- make sure it's very firmly connected at each point (battery end as well)
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.