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REAR DEFROSTER by RPYRAZOO
Started on: 11-03-2013 07:02 PM
Replies: 8 (183 views)
Last post by: rogergarrison on 11-05-2013 06:44 PM
RPYRAZOO
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Report this Post11-03-2013 07:02 PM Click Here to See the Profile for RPYRAZOOClick Here to visit RPYRAZOO's HomePageClick Here to Email RPYRAZOOSend a Private Message to RPYRAZOOEdit/Delete MessageReply w/QuoteDirect Link to This Post
What are the possible malfunctions that would cause the rear defroster to not work?
Thanks for your time,
Rich
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Gall757
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Report this Post11-03-2013 07:56 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
A break in any of those lines on the glass will open the circuit.....as well as the usual wiring and connector issues on a 25 year old car.
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Neils88
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Report this Post11-03-2013 08:07 PM Click Here to See the Profile for Neils88Click Here to Email Neils88Send a Private Message to Neils88Edit/Delete MessageReply w/QuoteDirect Link to This Post
Don't forget to start by checking the fuse. Switch could also be a problem.
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Bloozberry
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Report this Post11-03-2013 08:35 PM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
The defroster circuit also has a special relay that has an integral timer in it. If I recall correctly the first time you turn on the defroster the relay will stay energized for something like 15 minutes. Once it turns off, if you re-press the switch it will come on for something like 7 minutes each successive time after the first 15 minutes. It resets itself once you turn off the ignition. All this to say that it could be the defroster relay that's malfunctioned too. If you need a copy of the circuit from the FSM, just say so and I can post one for you.
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theogre
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Report this Post11-03-2013 11:52 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Bloozberry:
The defroster circuit also has a special relay that has an integral timer in it. If I recall correctly the first time you turn on the defroster the relay will stay energized for something like 15 minutes. Once it turns off, if you re-press the switch it will come on for something like 7 minutes each successive time after the first 15 minutes. It resets itself once you turn off the ignition. All this to say that it could be the defroster relay that's malfunctioned too. If you need a copy of the circuit from the FSM, just say so and I can post one for you.

10 then 5 or 5 then 2.5 depending on year. later cars have short on time. Times are labeled on the relay.
the "relay" is above brake pedal.

Most problem are defog grid on glass, switch, breaker is bad, or something is shorting and blow the breaker or fuse.
Relay maybe but is very reliable.

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RPYRAZOO
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Report this Post11-04-2013 04:43 PM Click Here to See the Profile for RPYRAZOOClick Here to visit RPYRAZOO's HomePageClick Here to Email RPYRAZOOSend a Private Message to RPYRAZOOEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks Guys. I'll start the inevitable elimation process.
Rich
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NiotaFiero
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Report this Post11-05-2013 01:33 PM Click Here to See the Profile for NiotaFieroClick Here to Email NiotaFieroSend a Private Message to NiotaFieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
Is there anything you can do if it is a break in the window grid?
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imacflier
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Report this Post11-05-2013 03:28 PM Click Here to See the Profile for imacflierClick Here to Email imacflierSend a Private Message to imacflierEdit/Delete MessageReply w/QuoteDirect Link to This Post
Yep: you can bridge the brake with conductive epoxy. Lots of kits for this, such as : http://www.amazon.com/Perma...Repair/dp/B000HBI9YQ

I have not tried any of these kits, but see no reason they will not work.

Larry
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rogergarrison
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Report this Post11-05-2013 06:44 PM Click Here to See the Profile for rogergarrisonClick Here to Email rogergarrisonSend a Private Message to rogergarrisonEdit/Delete MessageReply w/QuoteDirect Link to This Post
The best defroster I had in all my Fieros that I drove all winter was the engine heat rising thru the gap at the rear glass. I never turned on the electric defroster ever in any of them. In my Ferrari kit, i just used that grid for my radio antenna. Worked great. Lots of newer cars also use a rear glass wire grid for radio reception now. Magnum for one uses a grid in the rear glass.
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