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Rear defroster- when does it activate?


Well-known member
Jul 20, 2005
Scituate, MA
2000 Navy targa
Rear defogger mystery.... When does it activate?
In order for the rear window defogger to activate must the temperature be below a certain number? I'm guessing about ten years ago I just couldn't get the small LED to light up after replacing all of the bulbs in the HVAC head. Later, on a cool damp night when I needed the thing to actually work it did and so did the LED on the HVAC control.

I just finished replacing the bulbs again in that dual HVAC unit and I can't get the defogger LED to light up, but then it's a very nice 70 degrees. I did an extensive internet search on the subject and found a vague recollection like mine about temperature being a factor in order for the thing to work. Am I right about this or should I be shopping for a new head? Any way to test it?



2000 coupe, 6 speed, 124,000 miles

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