2006 chevy cobalt. replaced motor, got it running but fan is barely engaging and alternator wont charge the battery...any thoughts?

Check the fuses in the engine compartment

Is the belt tight enough or is it good?. That could be the first cause. Second, check that big cable from the battery, also the ignition cable.

The rotten egg smell usually occurs from time to time. It comes from the battery being charged by the alternator. However, if it smells continuously there is a problem. It's likely that your alternator is overcharging the battery. This needs to be looked at soon. The alternator will need to be replaced or repaired. Hope this helps.

How To Install Replace AC Heater Fan Blower Motor Chevy Cobalt Pontiac G5 05-10 1AAuto.com

Check the battery terminals for cleanlyness and tightness.
Check the voltage when stopped, it should be 12 volts.
Check the voltage with the motor running, it should be 14 volts. If not the alternator is not charging.
If the battery voltage is low then it may need replacing.

Sounds like you have a battery issue but could be the alternator wasnt charging it also last u drove and ran the battery down the best way to go is remove the battery from your trunk and take it into either a parts store or battery store and have them test it may take a while as they may have to charge it first to get a valid test so plan on dropping it off early in the day and returning a couple hours later if the battery tests ok after a full charge then reinstall it and should start with a full charge and then return to either your parts or battery store and they should be able to do a on car alternator test

2006 cobalt won't start after a severe thunderstorm. Battery was check and is good, light turn on, turns signals work a/c blower works, however, radio does not.Doesn't even click or turn over. All seniors check out. What's the problem?

i have a 05 cobalt SS Superchaged and i bought it new and had to warrenty two batteries and i put another battery n about 7 months ago

You have a problem with the blower motor resistor. This is a very commen problem on all gm cars and light trucks. The part is not to pricey. You can find the resistor under the glove box buy the blower motor. Two bolts and out it comes.

215 is not overheating. Does it keep getting hotter the faster you go? Does it cool off when slowing down or at idle? Does the Fan clutch or electric fan come on? When the engine is this hot.