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the following quote is taken from the web site from a chevy cobalt forum. if you have any more questions they might be able to help you directly.
(all it is is 2 bolts. Just take off your door panel and pull back the protective plastic and look for 2 bolts that line up with the door handle.)
on most of the new cars the head light assembly comes out pretty quick and easy. on top of the assebly there is typicaly two pins. there are eather steal or plastic. you have to pull these pin up and out of the back of the assebly. steal pins come all the way out, but plastic typical come only part of the way out. the assembly will then pull strait out, but can be a tight fit sometimes. unplug light bulbs and reverse procedure with new headlight assembly
be carefull not to touch the glass on the bulbs with you fingers. the oil from your skin will cause the bulbs to fail prematurely.
open the hood and unscrew and unplug the bulb, make sure not to touch the glass on the new bulb. your best bet if you have never done this sort of thing is to have someone else do it. most shops only charge $10-$15 to do it.
Fault with the IAC valve.there maybe a trouble code associated with it also./ Go to your nearby autozone or auto parts retailer and ask them to put a scanner to the car....make note of the codes if any are found. the IAC valve i usually locate don the throttle body and can be removed for inspection and sometimes cleaning using a good throttle body cleaner spray and a pipe cleaner brush.
6mm or 7/32 alen wrench.the adjustment screw is on the top of the light,easily seen with the hood opened. counter clockwise will raise the light,clockwise will lower it.did my daughters car this morning,took about 1 minute.used a big piece of cardboard obout 5 feet in front of car. to raise drivers side to match pass side.easy fix.
There will be adjustment screws located on at least two different spots surrounding each headlamp. By turning these screws you move the angle of the headlamp. Most shops will do this at a very resonable rate, I say this because improper headlamp angle may lead to a ticket, or at least a warning. To say the least, they have to be at specific angles and heights. Good luck.
There are 2 nuts at top of headlight..Loosen those, also remove plastic push in tabs from grill...after that You will need to pry the headlamp out.It will take a few mins.!! Do not repalce the bulbs w/ those "Blue" bulbs they last all of 2 months,Because of the daytime running lights.It takes the life out of the bulb cause they run hotter!