General Maintenance & Repairs Leaks | Squeaks | Clunks | Rattles | Grinds
Sponsored by:
Sponsored by: CARiD

Rear defrost--help please

Thread Tools
 
Search this Thread
 
Old Oct 31, 2011 | 08:38 PM
  #1  
NicB's Avatar
Thread Starter
On The Tree
iTrader: (4)
 
Joined: Oct 2011
Posts: 199
Likes: 0
From: North Platte, Ne
Default Rear defrost--help please

Tried searching but I couldnt find what I was looking for. My rear defrost turns on but for only a short time (1-2min) then off. Then I cant turn it on again for bout 5 minutes. Then it will stay on for bout another minute then off. What do I need to look at for fixing this problem?
Reply
Old Oct 31, 2011 | 09:22 PM
  #2  
LS6427's Avatar
Banned
iTrader: (2)
 
Joined: May 2008
Posts: 11,289
Likes: 13
From: South Florida
Default

Don't know if its normal, but thats what mines been doing for 13 1/2 years. It cycles on and off....so it doesn't burn up the elements......I guess.

.
Reply
Old Oct 31, 2011 | 09:46 PM
  #3  
wrencher's Avatar
wrencher
20 Year Member
iTrader: (2)
 
Joined: Aug 2002
Posts: 4,762
Likes: 2
From: Chicagoland
Default

Well if it goes out early & wont come back on for a few minutes I'd check the circuit breaker. It powers the circuit including the light in the switch when on.
other than that the timer relay might be an issue also.
Reply
Old Oct 31, 2011 | 10:17 PM
  #4  
85CamaroZ28's Avatar
TECH Apprentice
iTrader: (7)
 
Joined: Sep 2010
Posts: 343
Likes: 0
From: Nashville, TN
Default

Most likely it's the breaker (the ones with the shiny silver top) in the fuse panel that's in the dash. It wears out and trips early. Don't remember exactly which one it is but it's in your owners manual. Most people (including myself) replace it with a ? Amp fuse. You just have to make sure it cuts off in 10-15 mins or it could burn something up. I have had it like this for a year w/o any problem.

If you want to replace the breaker, its in the panel in the dash. Take it into the parts store and match it up. It will burn up again but some people just like having the piece of mind. Most of the time the timer will kick in and shut it off anyway.

Try the fuse. I don't remember what the correct amps are but it's whatever the breaker is rated too i believe. I'll take a look here in a min and post it up.
Reply
Old Oct 31, 2011 | 10:35 PM
  #5  
kyoytey1693's Avatar
TECH Resident
15 Year Member
Photogenic
Photoriffic
Liked
iTrader: (7)
 
Joined: Jan 2009
Posts: 809
Likes: 6
From: tulsa
Default

I bought my 96 with 74k on it and it has done it ever since, I bought my 01 with 34k on it and it has done it ever since as well. I'm not sure if it is a known issue or if it is functioning as designed. Either way neither of mine are even worth turning on. I'd like to know how to fix it as well.
Reply
Old Nov 1, 2011 | 08:36 AM
  #6  
wssix99's Avatar
Save the manuals!
15 Year Member
iTrader: (5)
 
Joined: Dec 2007
Posts: 12,969
Likes: 389
From: Chicago, IL
Default

This IS just your breaker getting old. (There are other posts on this.) Just put a new one in and you'll be set for another 10 years.

DON"T put a fuse in its place. The engineers put a breaker there for a reason... Fuses and Breakers trip at different time intervals.
Reply
Old Nov 1, 2011 | 11:53 AM
  #7  
85CamaroZ28's Avatar
TECH Apprentice
iTrader: (7)
 
Joined: Sep 2010
Posts: 343
Likes: 0
From: Nashville, TN
Default

Originally Posted by wssix99
This IS just your breaker getting old. (There are other posts on this.) Just put a new one in and you'll be set for another 10 years.

DON"T put a fuse in its place. The engineers put a breaker there for a reason... Fuses and Breakers trip at different time intervals.
They also put a timer in there for a reason. Plenty of people have put a fuse in its place and haven't had any trouble with it. Mine has been fine too.

OP put a replacement breaker in it. If that breaker wears out as fast as mine did, put a fuse in it. The timer will cut it off before anything bad happens.
Reply
Old Nov 1, 2011 | 06:03 PM
  #8  
NicB's Avatar
Thread Starter
On The Tree
iTrader: (4)
 
Joined: Oct 2011
Posts: 199
Likes: 0
From: North Platte, Ne
Default

Ok. Thanks guys
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-4

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-5

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
Old Dec 13, 2011 | 07:08 PM
  #9  
NicB's Avatar
Thread Starter
On The Tree
iTrader: (4)
 
Joined: Oct 2011
Posts: 199
Likes: 0
From: North Platte, Ne
Default

tried the breaker and a 30 amp fuse. still does same thing. doesn't burn up fuse though. what else should I check?
Reply
Old Dec 13, 2011 | 11:07 PM
  #10  
beyonddisturbed's Avatar
TECH Resident
iTrader: (5)
 
Joined: Dec 2009
Posts: 832
Likes: 1
From: Midwest
Default

i have a similar issue where it shuts off after just a couple minutes. also only the top half of the hatch seems to be defrosted. it must be an issue with these cars in general
Reply
Old Dec 14, 2011 | 10:01 AM
  #11  
wssix99's Avatar
Save the manuals!
15 Year Member
iTrader: (5)
 
Joined: Dec 2007
Posts: 12,969
Likes: 389
From: Chicago, IL
Default

Originally Posted by NicB
tried the breaker and a 30 amp fuse. still does same thing. doesn't burn up fuse though. what else should I check?
Could be the electronics module that controls the defroster. It has a relay and timer circuit inside, which can also go bad.
Reply
Old Dec 14, 2011 | 11:16 AM
  #12  
RPM WS6's Avatar
LS1Tech Administrator
20 Year Member
Shutterbug
Community Builder
Community Influencer
iTrader: (3)
 
Joined: Nov 2001
Posts: 34,647
Likes: 2,574
From: Schiller Park, ILL Member: #317
Default

After owning 4 of these cars, ranging from brand new to 100k+ miles, I've never had this problem.

Whatever it is, it's not normal and isn't how they were when new. So something needs to be replaced somewhere to restore proper operation.
Reply
Old Dec 14, 2011 | 07:58 PM
  #13  
NicB's Avatar
Thread Starter
On The Tree
iTrader: (4)
 
Joined: Oct 2011
Posts: 199
Likes: 0
From: North Platte, Ne
Default

Originally Posted by wssix99
Could be the electronics module that controls the defroster. It has a relay and timer circuit inside, which can also go bad.
Where is this located? can it be switched out?
Reply
Old Dec 14, 2011 | 09:32 PM
  #14  
wssix99's Avatar
Save the manuals!
15 Year Member
iTrader: (5)
 
Joined: Dec 2007
Posts: 12,969
Likes: 389
From: Chicago, IL
Default

I think its behind the dash. It can be switched out. There are threads somewhere on this site with more details. (I had a '90 Pontiac that went through two of these but it doesn't seem to be a recurring problem with F-Bodies.)
Reply
Old Dec 15, 2011 | 02:53 AM
  #15  
chrysler kid's Avatar
TECH Addict
20 Year Member
Photogenic
Liked
Loved
iTrader: (14)
 
Joined: Feb 2005
Posts: 2,720
Likes: 6
From: Mckinney Plano Frisco
Default

My camaro has this problem when the car is cold. If I warm the car up and then use the defrost it works fine.

My theory is that it's the switch. It won't fully click into position after its been on a while and my theory is the switch can sense resistance in the defrost
Reply
Old Dec 16, 2011 | 09:12 AM
  #16  
wssix99's Avatar
Save the manuals!
15 Year Member
iTrader: (5)
 
Joined: Dec 2007
Posts: 12,969
Likes: 389
From: Chicago, IL
Default

Originally Posted by chrysler kid
My camaro has this problem when the car is cold. If I warm the car up and then use the defrost it works fine.

My theory is that it's the switch. It won't fully click into position after its been on a while and my theory is the switch can sense resistance in the defrost
The switch doesn't work that way - the switch is a simple momentary switch. You are describing the function of the electronic module that controls the circuit. (I'd still switch out the breaker first, if you haven't already. Its also a heat-sensitive component and is cheap.)
Reply
Old Dec 17, 2011 | 08:41 AM
  #17  
NicB's Avatar
Thread Starter
On The Tree
iTrader: (4)
 
Joined: Oct 2011
Posts: 199
Likes: 0
From: North Platte, Ne
Default

I have switched the breaker. same result. put a 30 amp fuse in with same result. I guess its just not gonna work. it car sit in the garage and think about it. haha
Reply
Old Dec 17, 2011 | 09:26 AM
  #18  
wssix99's Avatar
Save the manuals!
15 Year Member
iTrader: (5)
 
Joined: Dec 2007
Posts: 12,969
Likes: 389
From: Chicago, IL
Default

Originally Posted by NicB
I have switched the breaker. same result. put a 30 amp fuse in with same result. I guess its just not gonna work. it car sit in the garage and think about it. haha
Sure it can be fixed. Just replace the control module. (Its just a lot more expensive than a breaker.)
Reply
Old Dec 20, 2011 | 04:58 PM
  #19  
NicB's Avatar
Thread Starter
On The Tree
iTrader: (4)
 
Joined: Oct 2011
Posts: 199
Likes: 0
From: North Platte, Ne
Default

I may fix it if i ever find the extra money for something that doesnt get used much. I have a few other things I have my eye on first.
Reply
Old Dec 20, 2011 | 05:56 PM
  #20  
chrysler kid's Avatar
TECH Addict
20 Year Member
Photogenic
Liked
Loved
iTrader: (14)
 
Joined: Feb 2005
Posts: 2,720
Likes: 6
From: Mckinney Plano Frisco
Default

Its just odd that only my camaros have had this problem and only when the vehicle isn't warmed up
Reply



All times are GMT -5. The time now is 12:13 PM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE