What are those thin lines stretched across my car's rear window?

Condensation is its enemy
by Drei Laurel | Jul 13, 2018

Have you ever wondered what those thin lines running across the length of your rear window are for? Chances are, you've noticed them but never bothered to find out (unless you already know the answer, in which case there's no point reading past this sentence).

Well, to an answer an anonymous reader's question, they're defoggers. These lines are electrified filaments which dissipate heat in the case your rear windows begins to fog up. Your front windshield comes equipped with defoggers, too. But since driving with a bunch of thin lines obstructing your view probably isn't ideal, it instead comes in the form of vents near the base of the glass.

Is this important? Well, yes it is. You're not going to be able to see too well with condensation eating up most of the rear window. But it's not as vital to us motorists in the tropics as compared to vehicles which constantly traverse colder climates, so we aren't really going to be using this feature that often. These heating elements are activated via a push of a button—specifically, the one with several wavy arrows crossing over a box.

So there you have it. Do you guys have any more 'bet you didn't know' car trivia about common but overlooked car parts? Let us know in the comments!

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