Interior Discussion about interior restoration, repairs, and modifications.

Rear Defrost?

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Old 12-20-2014, 10:38 PM
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Car: 1988 and 1987 Trans Ams
Engine: 305
Transmission: T5
Rear Defrost?

Has anyone ever put a defrost hatch into a car that didn't originally have it? I have a parts car that has a defrost hatch that I would like to put in my '87 TA.

Old 01-12-2015, 03:39 PM
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Car: '02 T/A WS6, '91 T/A, '91 Camaro RS
Engine: LS1, LB9, L03
Transmission: T56, 700R4, 700R4
Axle/Gears: 4.10 10 bolt, 2.73 10 bolts
Re: Rear Defrost?

You'll need the dash switch of course, and there's also a relay you'll need that bolts to the inside of the passenger side of the dash just behind the map pocket. Not sure if non-rear defrost cars had the electrical leads for rear defrost built into the standard or not, but all models should have the grounding points built into the rear hatch struts.
Old 01-15-2015, 02:46 PM
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Re: Rear Defrost?

Do you think the '84 TA would have the relay I would need?

I'm going to need to find a matching defrost button for my 87'.....

Old 01-15-2015, 03:46 PM
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Car: '02 T/A WS6, '91 T/A, '91 Camaro RS
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Transmission: T56, 700R4, 700R4
Axle/Gears: 4.10 10 bolt, 2.73 10 bolts
Re: Rear Defrost?

Dunno about an 84...IIRC, the one I got came out of an 85, and plugged right into my 91's harness and bolted up with no problems.
Old 01-16-2015, 10:14 PM
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Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
Re: Rear Defrost?

Shows Everything,.... 85+ set-up.


https://www.thirdgen.org/forums/elec...defroster.html



Old 01-16-2015, 10:24 PM
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Car: 1987 Camaro LT
Engine: LG4 w/ SLP headers & a 3" catback
Transmission: THM700R4 (Stock)
Axle/Gears: Stock 2.73 gears. No Posi
Re: Rear Defrost?

The wiring on mine was pretty easy to install. Still dont have the hatch though. But the switch works. lol
Old 01-18-2015, 01:09 PM
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Car: 1984 Trans Am
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Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Rear Defrost?

near the hatch, drivers side has power coming up from the dash, passenger side is grounded to chassis.
Old 01-18-2015, 01:09 PM
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Re: Rear Defrost?

I also need one of those under-dash rear-defrost timer relays but I can only find them used.
Old 01-19-2015, 01:02 PM
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Re: Rear Defrost?

The timer is built into my switch.
Old 01-19-2015, 01:48 PM
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Re: Rear Defrost?

Originally Posted by MY87LT
The timer is built into my switch.
Mine is as well, I just can't find a new one anywhere. All I can find are used on EBay.
Old 01-19-2015, 06:33 PM
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Car: 1988 and 1987 Trans Ams
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Transmission: T5
Re: Rear Defrost?

I'm not sure if I even want to deal with all this wiring crap or not....

I haven't tested the hatch yet either....
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