What is this

nickb2

Wrench. Diagnostic Tech.
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#2
Looks like a drainage elbow for removing humidity from the headlamp assembly.

In looking at the picture I uploaded here, you can see this lens assembly has 4 drains. Look familiar? Although this is for a BMW, I am pretty sure your 2005 elantra must have at least one. rear_of_e39_headlight.JPG
 

nickb2

Wrench. Diagnostic Tech.
Joined
Nov 22, 2008
Messages
8,652
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139
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Location
St-Hyacinthe, Quebec, Canada
#5
Haha, me thinks Dan and I posted at same time, but we are of same mind for this one. I would remove that headlamp assembly and put that back on with a bit of glue, will help the lens from fogging up in the future.