m0sh_man Posted November 18, 2005 Report Share Posted November 18, 2005 i looked all over the place for the switch location, i couldnt find it anywhere.... matthew Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 18, 2005 Report Share Posted November 18, 2005 Its on the HVAC control box, there should be a little picture of a square window with wavy lines, when you press it on the light will come one. Its very simple. Quote Link to comment Share on other sites More sharing options...
1990lumina Posted November 18, 2005 Report Share Posted November 18, 2005 Or are you talking about the relay type thing that operates the rear defrost?? Quote Link to comment Share on other sites More sharing options...
m0sh_man Posted November 18, 2005 Author Report Share Posted November 18, 2005 no i was talking about the switch itself to turn the rear defrost on, not the defrost for the dash, that ones obvious every car ive had with defrost in the past, just has a on/off type button located somewhere for the rear defrost Also going the HVAC ONLY blows on defrost/floor setting, what controls the movement of the ductwork? ive got a vaccum line hanging under the dash thats just got a plug in it, so im hoping that it goes to the hvac and just needs plugged back in. matthew Quote Link to comment Share on other sites More sharing options...
Prospeeder Posted November 18, 2005 Report Share Posted November 18, 2005 yea, check all of your vacuum lines, and make sure the checkvalve for the HVAC under the hood next to or under the cruise control servo isnt broken or bad. The button for rear defrost is ON the hevac controls, little button with a window and wavy lines, smaller than all the other buttons Quote Link to comment Share on other sites More sharing options...
White93z34 Posted November 18, 2005 Report Share Posted November 18, 2005 do you have the defroster grids on teh back window? its possable your car never had rear defrost. where eric showed you is where it will be if your hvac controls have the button, i've seen people replace the hvac controls for one reason or another and grab one from a car with no rear defrost. Quote Link to comment Share on other sites More sharing options...
m0sh_man Posted November 18, 2005 Author Report Share Posted November 18, 2005 mine has some grids in the rear window, im assuming its for rear defrost, but my car doesnt have that switch.... maybe its got the wrong control box? I have a vaccum line hanging under the dash of the car, where does it connect to under the dash? matthew Quote Link to comment Share on other sites More sharing options...
Prospeeder Posted November 18, 2005 Report Share Posted November 18, 2005 Not sure where that line goes, i THINK right into the control box, but go to the junkyard and find a control box with the rear defroster button, you definatly have it if you have the grids. Quote Link to comment Share on other sites More sharing options...
m0sh_man Posted November 18, 2005 Author Report Share Posted November 18, 2005 being that my car is a 1991 GTP 3.4L DOHC 5 speed, id assume it has rear defrost (especially being that its always been a northern car) ill take the control box out to fix the vacuum line when i get a new switch... guess i need a new dimmer switch and hvac control box. matthew Quote Link to comment Share on other sites More sharing options...
slick Posted November 18, 2005 Report Share Posted November 18, 2005 Reminds me, maybe I'll get my rear window defroster working for this winter. LOL Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 18, 2005 Report Share Posted November 18, 2005 I'm pretty sure rear defroster was standard equipment in 91. Maybe someone replaced your HVAC control box with one from 88-90. EDIT: It was a $170 add-on option. If you don't have the button but you have the grid, the box must have been replaced. Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted November 18, 2005 Report Share Posted November 18, 2005 Wow didn't come with rear defrost. GM is so fucked up sometimes. Quote Link to comment Share on other sites More sharing options...
Prospeeder Posted November 19, 2005 Report Share Posted November 19, 2005 my mom had a 92 grand am SE and it didnt have rear defrost, BIGGEST pain in the ass ever Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted November 19, 2005 Report Share Posted November 19, 2005 When I was renting cars this old guy from England rented a Sebring, and was like "where is the rear wiper?" Quote Link to comment Share on other sites More sharing options...
z34_nut Posted November 19, 2005 Report Share Posted November 19, 2005 My car doesn't have a rear defrost...never did. Quote Link to comment Share on other sites More sharing options...
m0sh_man Posted November 19, 2005 Author Report Share Posted November 19, 2005 son of a ***** my car doesnt have rear defrost, thats cheap... noticed the grids i was looking at were where the cheap previous owner put tint on it in layers so it didnt bubble on the back glass...... grrrr. matthew Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 19, 2005 Report Share Posted November 19, 2005 you have a GTP and it doesnt have rear defrost? thats fucked up. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted November 19, 2005 Report Share Posted November 19, 2005 you have a GTP and it doesnt have rear defrost? thats fucked up. i've seen that on high end w-bodys before, hell my 89' IROC camaro parts car dosen't have it, i think it was all the prospective owner of the car not seeing a need for one when it was ordered. personally i think it makes the rear window look nicer. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 19, 2005 Report Share Posted November 19, 2005 I couldn't imagine not having it. Quote Link to comment Share on other sites More sharing options...
fastbird232 Posted November 19, 2005 Report Share Posted November 19, 2005 ...because we live north of Florida, that's why... Quote Link to comment Share on other sites More sharing options...
supreme_style21 Posted November 19, 2005 Report Share Posted November 19, 2005 Wow didn't come with rear defrost. GM is so fucked up sometimes. I looked at a '94 GP as well that didn't have it. Kinda odd looking thru a window with no lines in it :? Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted November 19, 2005 Report Share Posted November 19, 2005 Wow didn't come with rear defrost. GM is so fucked up sometimes. I looked at a '94 GP as well that didn't have it. Kinda odd looking thru a window with no lines in it :? Wow.. you'd think a car that new would come standard with it. I highly doubt I will EVER see a car around here without rear defrost, cause we need them more than half the year. Quote Link to comment Share on other sites More sharing options...
94CutlassSLCoupe Posted November 19, 2005 Report Share Posted November 19, 2005 doesn't digitaloutsider's cutlass not have rear defrost either? I know we had a '91 Blazer 4x4 that didn't have it. Hell even our Cutlass Convertible has rear defrost though! Quote Link to comment Share on other sites More sharing options...
Turbo231 Posted November 20, 2005 Report Share Posted November 20, 2005 My car used to have a rear defroster... But as the miles add up and the age of my alternator continues (LQ1), I've decided it's better to let the alternator not worry about powering that grid. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 20, 2005 Report Share Posted November 20, 2005 I noticed today that the entire grid doesn't work... just parts of it. whats up with that? Quote Link to comment Share on other sites More sharing options...
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