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Chevrolet Cobalt Headlight Bulbs Replacement Guide
How to replace a burnt out low/high beam, turn signal or front side marker light bulb in a 2005-2010 GM Chevy Cobalt.

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Cobalt Headlight Assembly
Remove 10mm Bolt
Remove 2nd 10mm Bolt
This automotive "how-to" guide was specifically written to assist owners of the 2005, 2006, 2007, 2008, 2009 & 2010 Chevrolet Cobalt in replacing a burnt out low/high beam, turn signal and front side marker light bulb in the headlight assemblies.

Owners of other similar GM vehicles such as the Cruze, Impala, Malibu, Sonic, Lumina, Buick LaCrosse, Regal, Verano, Enclave, GMC Acadia, Yukon, Pontiac Grand Prix, G6, G5, Grand Am, GTO, Vibe, Sunfire, Oldsmobile Alero, Aurora, and Cutlass may also find this guide to be helpful.

Replacement bulbs for the 05-10 Cobalt from Sylvania and other manufacturers with their respective part numbers are as follows: combo low / high beam # 9007, front turn signal (parking) # 3157NA, and front side marker # 194.

The tools needed to replace any of the headlight bulbs include a 10mm socket with ratcheting wrench, a pop rivet panel fastener removal tool, needle nose pliers and a small flathead screwdriver.

Remove Fascia Fasteners
Using Panel Removal Tool
X-Mas Tree Fastener
The first few steps are to pop the hood, open it and move to the headlight assembly with the burnt out bulb.

Then use the 10mm socket with ratcheting wrench to remove the two bolts that hold the headlight assembly in place.

Before the headlight can be removed, you will also need to pull out the black plastic Christmas tree fastener that holds the front fascia piece in place.

Use an automotive panel removal tool to pry out the fastener and set it aside in a safe place. You may need another person's help to pull forward the front fascia panel while you remove the headlight assembly.

Pull the headlight assembly out at an upward angle and towards the radiator at the center of the vehicle.

Pull Out Headlight Assembly
Pry Up Retaining Clip
Pull Off Power Plug
To help prevent the painted surface of the front bumper from getting scratched, lay down a towel before resting the headlight assembly on the vehicle.

The combination Low/High Beam Bulb is the largest socket with the blue colored power connector. Remove the power connector by prying up the retaining clip with your finger or a small flathead screwdriver and then pull it straight off.

Retainer - Counter Clockwise
Remove Bulb Retainer Collar
1/4 Turn Counter Clockwise
Remove the black plastic collar nut that holds the headlight bulb in place by rotating it 1/4 turn counter clockwise.

Then rotate the base of the old headlight bulb 1/4 turn counter clockwise to remove it from the headlight assembly.

Pull Out Old Headlight Bulb
Philips 9007 LL
Insert New # 9007 Bulb
When handling the new halogen headlight bulb, be sure to not touch the glass part with your fingers or anything else greasy in the engine bay.

If you get the glass part of the new bulb dirty, wipe it clean with an alcohol moistened paper towel or tissue.

Insert a new # 9007 low/high beam dual filament headlight bulb back into the headlight assembly and rotate it 1/4 turn clockwise to lock it in place.


1/4 Turn Clockwise
Replace Bulb Retainer
1/4 Turn Clockwise
Replace the black plastic retaining nut over the headlight bulb and rotate it 1/4 turn clockwise to secure it in place.

Then push the blue headlight power connector on to the new headlight bulb until the retaining clip snaps into place.

Headlight Power Connector
Push Power On New Bulb
Turn Signal / Parking Light

The Turn Signal (parking light) bulb is located on the other end of the headlight assembly and has a medium sized black plastic socket.

Rotate the socket 1/4 turn counter clockwise and pull it straight out of the headlight assembly.

1/4 Turn Counter Clockwise
Pull Out Old # 3157NA Bulb
Push In New Bulb & Insert
Pull the old # 3157NA amber colored turn signal bulb straight out of the socket and push in a new bulb.

Insert the new turn signal bulb back into the headlight assembly and rotate the socket 1/4 turn clockwise to lock it in place.

1/4 Turn Clockwise
Front Sidemarker Socket
1/4 Turn Counter Clockwise
The Front Side Marker light bulb socket is light grey and located at the center of the headlight assembly.

Turn the socket 1/4 turn counter clockwise with a pair of needle nose pliers and pull it straight out of the headlight.

Remove Sidemarker Socket
Pull Old # 194 Bulb Out
1/4 Turn Clockwise
Pull the old # 194 side marker light bulb straight out of the socket and push in a new bulb.

If you would like to have brighter side marker lights, install some compatible replacement 194 LED bulbs.

Insert the bulb back into the headlight assembly and rotate the socket 1/4 turn clockwise with the needle nose pliers to secure it in place.

Testing Headlight Bulbs
Re-Install Headlight Assembly
Re-Insert Fascia Fastener
Test the new light bulb(s) by turning on the headlights, activating the hazard signals and flash the high beams.

Tuck back the wiring harness in to its original position before re-installing the headlight assembly into the bracket.

Fascia Fastener Secure
Replace 10mm Bolts
Tighten Two 10mm Bolts
Push the Christmas Tree type black plastic friction fastener back into the front fascia and thread the two 10mm bolts by hand to prevent cross threading.

Tighten the two bolts with the 10mm socket and ratcheting wrench to just past hand tight.

Don't forget to record the bulb change in your vehicle's service records.

For more, check out my other Chevy Cobalt Repair & Maintenance Guides.

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