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Chevrolet Cobalt Third Brake Light Bulbs Replacement Guide
How to replace a burnt out high mount or "third" brake light bulb in a 2005 to 2010 GM Chevy Cobalt with pictures.

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Cobalt Third Brake Light
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3rd Brake Light Housing
This automotive "how-to" guide was specifically written to assist owners of the 2005, 2006, 2007, 2008, 2009 or 2010 Chevrolet Cobalt in replacing a burnt out "high mount" or "third" brake light bulb in the trunk lid.

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 DIY guide to be helpful.

A replacement high mount stop lamp bulb for the '05-'10 Cobalt is part # 912 from various manufacturers such as Sylvania, GE, PIAA and Eiko.

You could also install some brighter compatible 912 LED bulbs.

No tools are needed to replace any of the three bulbs in the high mount brake light assembly.



 
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Press To Release Clips
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Pull Down Assembly
The first two steps are to open the trunk lid and locate the black plastic bulb housing on the under side of the trunk lid directly opposite of the red plastic third brake light lens cover.

To access the three 3rd brake light bulbs, press in on the two black plastic clips and gently lower the assembly down.

Try to avoid using excessive force, the bulb socket bracket should come out relatively easily.

If you have trouble removing the bracket, just gently wiggle it while pulling it down.



 

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Pull Out Old Bulb
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Push In New Bulb
Pull the old burnt out light bulb straight out of its socket and push in a new # 912 light bulb.

If you would like to have a brighter 3rd brake light, install some compatible replacement 912 LED bulbs.

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Re-Install Assembly
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Test New Light Bulb(s)
Raise the third brake light housing up to the trunk lid and snap it back into place. Make sure that both of the black plastic clips are secure.

Test the new high mount brake light bulb(s) by having someone step on the brakes.

Be sure 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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