|
Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
|
Thread Tools | Display Modes |
01-20-2017, 08:13 PM | #1 |
Leaky Injector
|
Help with S14 A/C lines - What am I missing
A/C was removed a long time ago and I'd love to get it back up in my S14 with S13 redtop SR20DET. I plan to get Codyace's bracket, but I know I'm missing lines and connections as well.
I have some questions weaved into what I think I know, but please correct me if I'm mistaken. I've searched through every A/C related page I could find. 1 - What does the circled plug coming from the receiver drier connect to? Was this a connection to the stock radiator fan or an A/C component? 01.jpg 2 - The circled A/C line runs from the receiver drier towards the passenger firewall. What I circled ends there with no connection to the firewall. 02.jpg Referencing this parts diagram, it looks like line 14, but the connection at the firewall side doesn't look the same. 3795120.png 3 - The connection circled here is at the passenger firewall. This looks like what part 17 from the parts diagram would connect to. I've searched, but can't seem to find this part at all or it's name. I'm also missing part 18, the line that runs over/behind the engine. I believe part 18 is the A/C low pressure suction line. 03.jpg 4 - This is the original low pressure line for this car. I believe this connects to the missing part 17 & 18 mentioned above. It seems I need to get lines from a 1995 as well to ensure it matches up. 04.jpg 5 - The high pressure line connecting to the condenser is still in place 05.jpg Am I missing anything else besides the A/C compressor and Codyace bracket itself to complete the hardware connections? Thanks for your time! |
Sponsored Links |
01-21-2017, 04:21 PM | #2 | |
Zilvia Junkie
Join Date: Jun 2012
Location: Lancaster county, PA
Age: 33
Posts: 465
Trader Rating: (4)
Feedback Score: 4 reviews
|
Quote:
This is the S14 AC system layout (minus condenser and evaporator) These are the firewall connections |
|
01-21-2017, 06:40 PM | #3 |
Leaky Injector
|
WOW, thank you so much for such helpful pictures and information! I've read that the A/C lines vary between 95 and later models of the s14. The connection points are supposedly sized differently. Would you happen to know if this is true for the firewall connection point as well? Would I be able to use all the A/C lines (from a 97 240sx) for the low pressure line all the way to my 95 firewall connection?
Your engine bay is clean enough to eat off of. Future goals for after things are finally working. |
01-22-2017, 09:32 AM | #4 | |
Zilvia Junkie
Join Date: Jun 2012
Location: Lancaster county, PA
Age: 33
Posts: 465
Trader Rating: (4)
Feedback Score: 4 reviews
|
I copied this from a previous thread of mine located here: http://zilvia.net/f/showthread.php?t=633397
Quote:
|
|
01-22-2017, 07:33 PM | #5 | |
Leaky Injector
|
Quote:
|
|
02-15-2017, 03:00 PM | #6 |
Leaky Injector
|
Can someone tell me what this plug on the A/C compressor is for? Mine is a single green wire, is it just ground? If it's ground, I was just going to cut the connection off and make a new one. I can't find where it connects to on my S14 since it was all removed so long ago.
|
02-15-2017, 06:17 PM | #7 |
Zilvia Junkie
Join Date: Jun 2012
Location: Lancaster county, PA
Age: 33
Posts: 465
Trader Rating: (4)
Feedback Score: 4 reviews
|
It's the power wire to the compressor clutch coil. Ground is routed through the compressor body and the engine block. The chassis connector for that is located a few inches from the frame rail. Wiring harness runs from the brake master cylinder, down the driver's side strut tower, along the driver's side frame rail, then splits off: one connector to the power steering pressure switch and one connector to the AC compressor.
|
02-15-2017, 08:01 PM | #8 |
Leaky Injector
|
You are the best. I owe you a beer.
I followed the power steering pressure switch connector (that was joined with my MAF) sensor to the brake booster. From there the wiring is a mess. I found a snipped wire that is blue with a green stripe that I suspect is the compressor clutch power wire you mentioned. However, I referenced the FSM and if I'm reading it right, it should be a blue with a red stripe (L/R)? Am I looking at the wrong thing here? |
02-15-2017, 08:18 PM | #9 |
Zilvia Junkie
Join Date: Jun 2012
Location: Lancaster county, PA
Age: 33
Posts: 465
Trader Rating: (4)
Feedback Score: 4 reviews
|
If your MAF wiring was routed through the driver's side wire harness, your wiring has been heavily modified, to say the least.
The compressor clutch wire color should be L/R, yes. The blue/green you found might be for cooling fan relay 2. Do you have the original cooling fan and relays in place and operational? Also, is the triple pressure switch (mounted on the dryer) wiring intact? |
02-15-2017, 08:30 PM | #10 |
Leaky Injector
|
Yes, it's a mess and trying to figure out what was done with my limited knowledge doesn't help.
E-fans are installed, but the triple pressure switch is in tack and wired. It's pictured in my first image attachment when I was still sourcing missing parts. Edit: I think my best option is to run a new connection directly from the E5 AC relay at the fuse box. Please let me know if you have a more effective solution. Thank you Last edited by lagvoid21; 02-15-2017 at 09:26 PM.. |
02-17-2017, 06:42 PM | #11 |
Zilvia Junkie
Join Date: Jun 2012
Location: Lancaster county, PA
Age: 33
Posts: 465
Trader Rating: (4)
Feedback Score: 4 reviews
|
That'll work, yes, but you'll still want to run a wire to the M63/F3 plug. The ECU needs that voltage signal to idle-up the engine when the AC compressor is running.
I would start opening the wire harness assembly to find where the wire has been cut then splice in a new extension. It'll be more effective than running new wires. |
02-17-2017, 09:14 PM | #13 |
Leaky Injector
|
Thanks for pointing these things out. It all makes sense in hindsight, but I didn't consider triggering the e-fans.
I read through an old A/C thread that details getting the A/C switch to actually turn the compressor on (by jumping the A/C Hand switch Y/B wire to AC Relay B/P) here: http://www.freshalloy.com/showthread...me-on-in/page7 It didn't seem to provide clear steps to get the idle-up that you mentioned. Is there another wire to jump to get this to work? I think the A/C compressor power is actually still in the factory wiring, just the connection leading into the engine bay to compressor was removed at some point. I'll have my multimeter back Sunday so I can test continuity to find the right wire from the fuse box. I'm just not sure which plug inside the cabin they feed to. Can you PM me your email as well? I really owe you and appreciate all your help. |
Bookmarks |
|
|