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PopUpProject
Joined: 06 Aug 2025
Posts: 116
Location: NE Ohio
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 Posted: Mon Mar 09, 2026 12:10 am Post subject: What are these things? |
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Hey guys,
This weekend was a HUGE weekend for us and Poppy. It was not without its emotional rollercoaster and be prepared for me to call for help with fueling and getting the engine tuned properly in the near future. I spent a lot of the weekend playing the game of reading the Haynes manual and trying to figure out what things are in the engine bay and we've found a handful of things we can't quite figure out from the manual and staring at engine bay photos. Here's a folder of everything and if anyone has any ideas on what these remnants could be please let me know: https://drive.google.com/drive/folders/1nrT4JJvoPt3apgjzXi_Hylsgh3pvJ3KB?usp=sharing
BUT in the column for things accomplished this weekend: new expansion tank bracket and tank with a full coolant drain and flush, fixed a handful of vac leaks, installed a new o2 sensor as the one in the car was literally cut into two pieces, new spark plugs (separate post coming soon most likely on the ones we pulled out), and DISCOVERED THESE THINGS HAVE A HOOD PROP
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Poppy the '82 924 Resurrection in Progress |
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924RACR
Joined: 29 Jul 2001
Posts: 9071
Location: Royal Oak, MI, USA
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| Posted: Mon Mar 09, 2026 8:36 pm Post subject: |
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Your mystery items look to be all from the AC system being removed.
Wires for compressor, wires behind the headlight for the pressure switch by the drier, and a cut hose.
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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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PopUpProject
Joined: 06 Aug 2025
Posts: 116
Location: NE Ohio
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| Posted: Tue Mar 10, 2026 1:11 am Post subject: |
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| 924RACR wrote: | Your mystery items look to be all from the AC system being removed.
Wires for compressor, wires behind the headlight for the pressure switch by the drier, and a cut hose. |
Awesome, thanks Vaughan! I can pull out/wrap up the wires and the hose can live in the firewall unbothered. Is there anything else to look around for remnants wise with the AC system? I think they literally hacked it out of the car.
Do you happen to know what the wires in the wheel well are?
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Raize
Joined: 18 Sep 2013
Posts: 447
Location: Scotland
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| Posted: Tue Mar 10, 2026 1:22 am Post subject: |
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| PopUpProject wrote: |
Do you happen to know what the wires in the wheel well are? |
In-tank fuel pump wires. Someone has replaced it with a strainer on your car so you no longer have an in-tank fuel pump - if you did have one then that big hex where the fuel outlet hose exits the tank would have 2 spade terminals on it where these wires would have plugged in.
Tape them off, tie them up, and forget about them. |
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PopUpProject
Joined: 06 Aug 2025
Posts: 116
Location: NE Ohio
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| Posted: Tue Mar 10, 2026 1:34 am Post subject: |
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| Raize wrote: |
In-tank fuel pump wires. Someone has replaced it with a strainer on your car so you no longer have an in-tank fuel pump - if you did have one then that big hex where the fuel outlet hose exits the tank would have 2 spade terminals on it where these wires would have plugged in.
Tape them off, tie them up, and forget about them. |
Thanks Raize!!! I'll have to investigate the strainer situation at some point, but good to know I'm not running completely on magic for fuel XD I was seriously questioning (and still kinda am) how this was getting fuel with two somewhat important looking connectors just hanging out
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Poppy the '82 924 Resurrection in Progress |
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Raize
Joined: 18 Sep 2013
Posts: 447
Location: Scotland
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| Posted: Fri Mar 13, 2026 9:47 pm Post subject: |
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| PopUpProject wrote: | | Raize wrote: |
In-tank fuel pump wires. Someone has replaced it with a strainer on your car so you no longer have an in-tank fuel pump - if you did have one then that big hex where the fuel outlet hose exits the tank would have 2 spade terminals on it where these wires would have plugged in.
Tape them off, tie them up, and forget about them. |
Thanks Raize!!! I'll have to investigate the strainer situation at some point, but good to know I'm not running completely on magic for fuel XD I was seriously questioning (and still kinda am) how this was getting fuel with two somewhat important looking connectors just hanging out |
The external fuel pump is the silver cylindrical thing with other wires going to it and performs the heavy lifting when it comes to fueling.
The strainer is not a problem, you will lose interest in investigating the in-tank pump as soon as you see the price of them. Loads of people running strainers with no problems. |
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PopUpProject
Joined: 06 Aug 2025
Posts: 116
Location: NE Ohio
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| Posted: Fri Apr 24, 2026 10:22 pm Post subject: |
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Hey guys!
I'm back with more mystery questions. These should be easy for you guys but for me, am confused. I started tearing out the glovebox, carpet, and the kickpanel. It looks semi factory semi not. But I also have no idea what any of the stuff is that is hiding back there. Does anyone happen to have a photo with labels for all of the different things? I haven't been super successful in finding a video that says what stuff is back there when looking at dash removal videos and trying to piece together the different PET diagrams has my head spinning.
Here's a video: https://drive.google.com/file/d/1AcYs7iOQ5pSeEWojhKeIFKEDw2qjllCN/view?usp=sharing The bigger red and black wire was cut and stuffed into the glovebox and I've back traced it to somewhere in the center console. I haven't removed the center console yet because I don't want to fully open the electrical nightmare yet.
Any of this specifically for running the AC? I can't confirm if the normal blower air works as I don't remember if we've tried it or not and I believe the heat sort of works if I remember properly.
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924RACR
Joined: 29 Jul 2001
Posts: 9071
Location: Royal Oak, MI, USA
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| Posted: Sat Apr 25, 2026 12:00 am Post subject: |
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Hmmm, large red and black wire... the only thing I can think of at the moment for a large red and black wire remotely related to the interior might be power windows; I don't remember if your car has those or manual?
Otherwise I'm thinking of one of the main power leads from the battery - red with black stripe. I don't know that I've ever seen a black with red strip in a 924.
Gotta check the electrical diagrams... OK, vague recollection your car might be a '78? The ONLY thing I see using a large (4.0mm) red with black stripe is related to circuit 50, which is the main ignition on feed, specifically the fuel pump relay. There are a small number of things using smaller (1.0 - 0.5mm) red/black wires - the stop lights (taillights, including relay) and the cold start valve. The latter of course is only in the engine bay...
Where was that wire originally, exactly?
EDIT: Duh, the answer's right there, you have an '82... my bad.
The above info still applies; in addition, there's a 1.5mm black/red wire from the horn relay to the horns themselves. Power lead to the fresh air fan is black/violet.
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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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PopUpProject
Joined: 06 Aug 2025
Posts: 116
Location: NE Ohio
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| Posted: Sat Apr 25, 2026 12:19 am Post subject: |
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| 924RACR wrote: | Hmmm, large red and black wire... the only thing I can think of at the moment for a large red and black wire remotely related to the interior might be power windows; I don't remember if your car has those or manual?
Otherwise I'm thinking of one of the main power leads from the battery - red with black stripe. I don't know that I've ever seen a black with red strip in a 924.
Gotta check the electrical diagrams... OK, vague recollection your car might be a '78? The ONLY thing I see using a large (4.0mm) red with black stripe is related to circuit 50, which is the main ignition on feed, specifically the fuel pump relay. There are a small number of things using smaller (1.0 - 0.5mm) red/black wires - the stop lights (taillights, including relay) and the cold start valve. The latter of course is only in the engine bay...
Where was that wire originally, exactly? |
Hey Vaughan, the wire originally came out in the glovebox. When I opened the glovebox, in the middle upper back behind the light someone punched a hole and it used to be connected to something that has been since cut off. When I pulled out the glovebox, I started to back trace the wire and it seems to go to the center bottom of the center console, if that makes sense. I don't believe it is factory by any means (at least I sure hope its not)
The power windows on the passenger side don't work (driver side does), but I only found two sets of wires that run to the door. The one long yellow and white one that was running around under the carpet and has been wire nutted together I am assuming is for the speakers. The other is a bundle of wires that I assume if I take the doorcard off and trace is for the windows.
These are not the best pictures because they're screenshots of a video I had sent to a friend about the carpet eviction, but these kinda show the wires https://drive.google.com/file/d/1aOG4KxyhmAYtb99X0M-GT4rRGsf8PkDu/view?usp=sharing https://drive.google.com/file/d/1yIV6KToR8R81o7saf3qC6r-G3QWgn9vg/view?usp=sharing
and then you can see the wire poking out of the glovebox here https://drive.google.com/file/d/1V9rBMg3Ghy0DZ-Qk-FsycBp92abFGe2m/view?usp=sharing
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924RACR
Joined: 29 Jul 2001
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Location: Royal Oak, MI, USA
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| Posted: Sat Apr 25, 2026 12:35 am Post subject: |
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Oh yeah, very not factory with that black/red wire... I was envisioning something striped, not a dual wire like that.
Agreed that the others look like old speaker wiring, quite suitable for ditching and replacing with modern stuff as suits your stereo needs...
Also a bit surprised to not see any insulation under your carpet... it's been a while since I last looked an an original car, but seems like there should be some sound deadening too? Unless maybe it's just the original stuff bonded to the floor metal...
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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
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PopUpProject
Joined: 06 Aug 2025
Posts: 116
Location: NE Ohio
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| Posted: Sat Apr 25, 2026 7:20 am Post subject: |
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| 924RACR wrote: | Oh yeah, very not factory with that black/red wire... I was envisioning something striped, not a dual wire like that.
Agreed that the others look like old speaker wiring, quite suitable for ditching and replacing with modern stuff as suits your stereo needs...
Also a bit surprised to not see any insulation under your carpet... it's been a while since I last looked an an original car, but seems like there should be some sound deadening too? Unless maybe it's just the original stuff bonded to the floor metal... |
So uh I have already evacuated most of the sound deadening, Styrofoam footwell block thing, and this weird material that I can best describe as slate, where its hard but also super brittle. We discovered where the rain was leaking....... into the passenger floor.
That is how this adventure has started because when we tried to fix the battery tray we went looking for where it was draining since stuff wasn't making it to the drain hole.
Do you know what any of the actual hardware components up there are? I've started trying to use the PETs to see what is what and its making my head spin
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Poppy the '82 924 Resurrection in Progress |
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PopUpProject
Joined: 06 Aug 2025
Posts: 116
Location: NE Ohio
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| Posted: Sat Apr 25, 2026 11:54 am Post subject: |
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Update: went back with a label maker and started labeling all of the random wires around the car, and I was able to confirm the yellow/white wire is for the aftermarket speakers.
I also took better photos of everything back there behind the dash. The "nippondenso" based on a google is for the climate controls I think? It also looks pretty rough so that's fun. Here's all of the photos, I ended up just throwing them into a drive https://drive.google.com/drive/folders/1xTODROGUI6MZ_Bzh6RdcpwG399WTc606?usp=sharing
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924RACR
Joined: 29 Jul 2001
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Location: Royal Oak, MI, USA
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| Posted: Sat Apr 25, 2026 9:22 pm Post subject: |
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Yup, that Nippondenso part is a controller for the AC, turns the compressor on and off based on the temp of the evaporator.
That stuff all looks just like the AC on my '82 (really, '81) Turbo... which now works well on 134a!
That vacuum canister looking thing I'd guess is an actuator for one of the air doors on the HVAC - maybe a late '82-only part, more like 944, as I don't have that... all my HVAC doors are manual.
Those wire nuts and crap gotta go, they're nasty!!
Ultimately you'll want to add back in that styrofoam block thing - it's just a comfortable footrest for the passenger - and sound deadening... I have little, wish I had more, and will be adding it back in when I get around to doing new carpet some day. The road noise on the cruise is just a bit tiring after an hour on the highway, makes me not want to take any road trips...
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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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PopUpProject
Joined: 06 Aug 2025
Posts: 116
Location: NE Ohio
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| Posted: Sat Apr 25, 2026 9:43 pm Post subject: |
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| 924RACR wrote: | Yup, that Nippondenso part is a controller for the AC, turns the compressor on and off based on the temp of the evaporator.
That stuff all looks just like the AC on my '82 (really, '81) Turbo... which now works well on 134a!
That vacuum canister looking thing I'd guess is an actuator for one of the air doors on the HVAC - maybe a late '82-only part, more like 944, as I don't have that... all my HVAC doors are manual.
Those wire nuts and crap gotta go, they're nasty!!
Ultimately you'll want to add back in that styrofoam block thing - it's just a comfortable footrest for the passenger - and sound deadening... I have little, wish I had more, and will be adding it back in when I get around to doing new carpet some day. The road noise on the cruise is just a bit tiring after an hour on the highway, makes me not want to take any road trips... |
Thanks Vaughan! I'm not sure if this would make her a late or an early 82, but the production sticker says Manufacture date of December 81.
Is the Nippondenso needed still since my AC has been removed or does it do something else for nonAC airflow? Ultimately while I'm in here I want to figure out what all this stuff is and remove anything for stuff that I no longer have and deredneck most things
The wire nuts and whatnot will go once I figure out where all the wires go. Any good wire diagrams that aren't teeny tiny? I have terrible eyesight so trying to squint at tiny lines isn't super fun.
I'll add back in sound deadening and all of that stuff at some point, but I need it to stop raining in the car first XD
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Poppy the '82 924 Resurrection in Progress |
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924RACR
Joined: 29 Jul 2001
Posts: 9071
Location: Royal Oak, MI, USA
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| Posted: Sun Apr 26, 2026 1:32 am Post subject: |
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Maybe some reading glasses and brighter lights? Worked for me!! Yeah, none of us is getting younger... 
Pelican used to have some wiring diagrams online, but I think not all years, and they may not still be there. I have actual hardcopy original manuals... but a digital scan is a lot easier to enlarge!
That 'Denso box won't be needed for airflow... likewise the larger box under the battery tray doesn't do much without functional AC except to add a better air fan than stock. That said, removing it will open up some air paths that would want to be rerouted to close things off properly - otherwise you'll end up with air blowing loose under the dash, of course, instead of cooling or defrosting.
One important note, however, in the removal process... the AC wiring ties in to the control wiring for the rad fans, and those two relays up there are part of the equation. So you can't safely just remove those without some corrective wiring. One part of this was to force both fans on when you switch on the AC blower fan (which is convenient when you want to prevent the car from overheating... even if the AC system is otherwise dead)...
So for now best to leave those relays in place, and some testing would be wise to ensure both fans are able to come on when the rad temp switch is shorted (to simulate on)...
The "true" '82s seem to be the ones with the squirrel cage (modern style) fresh air fan at the base of the windshield, vs. the old propeller style. Dec '81 would definitely be on the fence... mine, for comparison, is a May 81 car...
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