rear defrost dont work...
rear defrost dont work... Since I bought my car the rear defrost hasnt worked. I push the button but nothing happens... the light doesnt even light up, and from my understanding the switch clicks on/off, but it doesnt do that either. The seats work so its not the breaker. I tried swapping it out with the window breaker and nothing changed. So I can eliminate the breaker being blown. What else can I check to figure out why the rear defrost doesnt turn on?
Was or is your rear window tinted? Maybe the person who removed tint or when he was putting it on fucked it up and cut the lines. Slim chance that ALL the lines don't work unless he used a razor blade right down the whole thing though. Check your defroster lines and make sure there not cut somewhere
TECH Senior Member
Joined: Dec 2001
Posts: 5,399
Likes: 3
From: Jacksonville, FL
Was or is your rear window tinted? Maybe the person who removed tint or when he was putting it on fucked it up and cut the lines. Slim chance that ALL the lines don't work unless he used a razor blade right down the whole thing though. Check your defroster lines and make sure there not cut somewhere
TECH Fanatic
Joined: Aug 2006
Posts: 1,407
Likes: 63
From: Knappa, Oregon
Since I bought my car the rear defrost hasnt worked. I push the button but nothing happens... the light doesnt even light up, and from my understanding the switch clicks on/off, but it doesnt do that either. The seats work so its not the breaker. I tried swapping it out with the window breaker and nothing changed. So I can eliminate the breaker being blown. What else can I check to figure out why the rear defrost doesnt turn on?
If you decide that is the problem, I can tell you how to change it. It's simple plug and play.
I was playing with my rear defrost this morning, and determined by trial and error that it works only under certain circumstances.
Water on the window = no
Frost on the window = yes
Window covered entirely with dew, just above freezing temp = no
Nothing on the window = no
Water on the window = no
Frost on the window = yes
Window covered entirely with dew, just above freezing temp = no
Nothing on the window = no
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Was or is your rear window tinted? Maybe the person who removed tint or when he was putting it on fucked it up and cut the lines. Slim chance that ALL the lines don't work unless he used a razor blade right down the whole thing though. Check your defroster lines and make sure there not cut somewhere
If the switch doesn't light up or click, the switch is probably bad. Another one of those common faults with GM F-bods. Unfortunately the defog switch is part of the whole heat/air/cooling unit below the sound system. It's not hard to change but you have to replace the whole unit and you are looking at a couple hundred bucks or less just for the part. I think I paid $125 about 6years ago.
If you decide that is the problem, I can tell you how to change it. It's simple plug and play.
If you decide that is the problem, I can tell you how to change it. It's simple plug and play.
I was hoping there was a common problem and easy fix that I didnt know about.
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I had this problem when I bought my car, the dealership fixed it for me. As was stated, if the switch is bad, which sounds like the problem, the whole HVAC unit must be replaced. Whoever figures out a way to fix just the switch should get some sort of prize. I wish I had asked for my old one so I could play around with it. I'll bet there is a way to fix it, with all the clever fixes for non-serviceable parts people on here have come up with, I think it could be done.
TECH Fanatic
Joined: Aug 2006
Posts: 1,407
Likes: 63
From: Knappa, Oregon
I bought mine through the dealership. I"m not sure if it's available as an aftermarket part. It's a common problem alright. And you would hope that you could just replace the switch, but it is integral to the whole heating control unit.
