GP aerocoupe rear leak

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zwarge

Not-quite-so-new-guy
Aug 15, 2021
11
3
3
Tucson, az
Hello,

Has anyone had their aero coupes apart for replacing the seals or anything? If so could I get some education on how the rear A: goes together correctly and B: what exactly seals the rear? about 2 years ago I purchased a aero coupe. when I received the car it seemed to be in a body shop at some point in its life. the pervious owner bought it in the condition I got it in and just never got to fixing it up. the entire aero coupe kit was uninstalled and the entire car primed. so crappy quarter panel job done (in my opinion) and new doors instead (inside that awful bright green). since taking ownership I've tried (un)educated guesswork on how the rear is installed but have had issues since. I've got sealer on the metal trim window frame but other then that I did a dumb thing and tried seam sealing the larger fiberglass filler panel in to only half the car seals the passenger side is a water fall when tested with a water bottle. I did this about a year and a half ago and never thought to test it until recently. I've also tried getting help with my dads knowledge due to the fact that he also owns a GP aero coupe but he's in Maine. the time difference and life makes it difficult to just facetime to see his car and get the info I need cause his cars complete and he has never disassembled it since owning it since the early 90's. Luckily I'm in Arizona so rain isn't a major issue but I wanted the feel good of knowing the car is sealed. plus the monsoons here come quickly and would turn the trunk into a pool within an hour. any help would be greatly appreciated.



my build so far: 19886 Pontiac Grand Prix aerocoupe
Engine: 2002 5.3L iron LS ran on a Holley terminator
Fuel: aeromotive Stealth 450LPH in-tank pump setup
Trans: Super t-10 2 groove 2.43 First gear, American powertrain Sick seconds hydromax kit
wheels/: aero wheels 51 series 15x8 4 in BS fronts 15x10 4.5 BS rears
tires: fronts 265/50/r15 rears are 295/50/r15
suspension: UMI 2in drop coils Bilstein 24-009294/24-009492 shocks
interior: Gbodyparts.com door panels. entire cabin killmat sound deadened. 06 GTO power seats (cut factory tabs off and welded new tabs on the power rails) for the front
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Current Look.


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PS: first post on a thread so if I'm doing this wrong please let me know. thank you


edit: the more specific area I need help with is what seals the black panel from the factory trunk area… the rear window it self is a fresh install from a local glass company and works great. The “filler panel” that fills where the factory trunk should be sitting is where I need help. Thanks for all the replys
 
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81cutlass

Comic Book Super Hero
Feb 16, 2009
4,645
13,561
113
Western MN
There is a plastic rubber seal the surrounds the window and it's glued in. However I don't know where to get a replacement and I need a new one for mine also.
 

69hurstolds

Geezer
Supporting Member
Jan 2, 2006
8,185
17,568
113
Ah, the pain of finding unobtanium parts.

You would think someone would have a "junk" one somewhere so one of these vendors could rake in on making suitable replacements. If I had the facilities to make them, I'd certainly do it.
 
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88AZSS

Master Mechanic
Mar 13, 2018
435
1,098
93
Mesa, AZ
Welcome to the forums! Im also in AZ! I think I may have seen this car on OfferUp or Craigslist a few years back if Im not mistaken. Cant see there being many of these going around still.

I dont have a specific answer to your question but would maybe suggest picking up a CSM for this particular model year. That should show you how assembly and reassembly goes and what parts are involved.

Good luck!
 

zwarge

Not-quite-so-new-guy
Aug 15, 2021
11
3
3
Tucson, az
Welcome to the forums! Im also in AZ! I think I may have seen this car on OfferUp or Craigslist a few years back if Im not mistaken. Cant see there being many of these going around still.

I dont have a specific answer to your question but would maybe suggest picking up a CSM for this particular model year. That should show you how assembly and reassembly goes and what parts are involved.

Good luck!
These cars where made in a rush. Idk about montes but the Grand Prix got these kits installed after production… it was a normal Grand Prix when it left the factory in Canada and shipped to the us and a third party install these kits. There is no manuals that I can find for these cars.
I bought it off Facebook south of Phoenix. Guy had it posted for 2k I bought it for 1000bucks and drove it onto a U-Haul trailer.. I still feel like I got a good deal but… finding info on these go aerocoupe a is tedious and sometime non-existant.
 
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Blake442

Geezer
Apr 24, 2007
6,864
1,997
113
Minneapolis
That roof line where it meets the window is way to crisp...
They originally were hammered down and rounded off to better match the profile of the rear glass.
Are you sure this is a legit 2+2 because I'm getting the impression it's a re-body...
 

zwarge

Not-quite-so-new-guy
Aug 15, 2021
11
3
3
Tucson, az
That roof line where it meets the window is way to crisp...
They originally were hammered down and rounded off to better match the profile of the rear glass.
Are you sure this is a legit 2+2 because I'm getting the impression it's a re-body...
Honestly I have no clue …. It’s got all the tell tale signs of 2+2 from the interior paint under the carpet to all the correct options. Even the extra bushing in the rear of the frame (I think location 6) lsd, the frame braces… but I have no paperwork to prove it is… but it has crossed my mind.
 

zwarge

Not-quite-so-new-guy
Aug 15, 2021
11
3
3
Tucson, az
Honestly I have no clue …. It’s got all the tell tale signs of 2+2 from the interior paint under the carpet to all the correct options. Even the extra bushing in the rear of the frame (I think location 6) lsd, the frame braces… but I have no paperwork to prove it is… but it has crossed my mind.
With my research the very early few hundred had a issue where the glass poke up above the roof line. Which mine does.
 

88AZSS

Master Mechanic
Mar 13, 2018
435
1,098
93
Mesa, AZ
These cars where made in a rush. Idk about montes but the Grand Prix got these kits installed after production… it was a normal Grand Prix when it left the factory in Canada and shipped to the us and a third party install these kits. There is no manuals that I can find for these cars.
I bought it off Facebook south of Phoenix. Guy had it posted for 2k I bought it for 1000bucks and drove it onto a U-Haul trailer.. I still feel like I got a good deal but… finding info on these go aerocoupe a is tedious and sometime non-existant.
Yup, you are correct. I forgot about those being done after the fact. At this point, its looking like itll be one of those "whatever makes it work" scenarios.

Yes I think that is the same one then. I remember considering looking at it but at the time had nowhere to store it and my car wasnt even on the ground yet so I didnt need another project. Glad you got it tho and looks like youre heading in the right direction with it.
 
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