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12-03-2018, 09:40 PM | #1 |
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Vintage air question
I have a 5.3 gen iii and I am trying to install it. I want to use the pcm to run the a/c system but it is a stand alone system from vintage air. My gen iii harness says I have a lime green wire that is for the a/c clutch and a red that is a/c request. Where do I hook them up to? I have found that I have a Sanden sd7 compressor and it will have to be tuned to fixed in hptuner. Just really don't want to mess up my new system. Any help would be great. Thanks
Last edited by Gunnin4ya; 12-03-2018 at 09:50 PM. |
12-06-2018, 09:49 PM | #2 |
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Re: Vintage air question
If its a stand alone from vintage, well thats all you need.
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12-06-2018, 11:12 PM | #3 |
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Re: Vintage air question
I'm sure that's not what he is wanting to know... perhaps he wants to know how to have the vintage air be controlled by the ecu like factory.. I dont jave vintage air, nor a diagram. So post up a diagram and I could look at at and give you advice... More than likely the a/c request will be the power from the stand alone vintage air unit to compressor.. If the harness was modified like factory and it will have a relay, that output wire (ac clutch wire) will go to the compressor.. so it will then operate like factory Im sure vintage air has similar instructions
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12-07-2018, 01:57 PM | #4 |
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Re: Vintage air question
What is the benefit of having the ECM control the A/C? other than shutting it off when you floor it? unless you are using the ECM to control electric fans when the A/C is turned on???
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12-07-2018, 03:19 PM | #5 |
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Re: Vintage air question
Control fans, idle and shut off over whatever rpm you set it to. Sanden sd7 is good to about 6000 rpm. Mine can spin up to around 7400 before the limiter hits.
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12-07-2018, 05:53 PM | #6 |
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Re: Vintage air question
Idle is a reason all by its self.....
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12-08-2018, 12:47 PM | #7 |
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Re: Vintage air question
I think most people underestimate the abilities of the PCM. It is a microprocessor capable of very small changes at very high speeds, so the IAC (Idle Air Control) motor, or throttle body in DBW applications can adjust for just about any load thrown at it. Combine that with the fact that modern compressors don't put that big of a load on the engine, running an A/C system stand alone isn't a bad idea. Sure, you will need a trinary switch to run the fans, and you loose the full throttle cut off, but back in the day, you just turned the air off for a second if you needed to race the guy in the next lane! PCM control isn't as easy on some set ups as it is on others, so some times it just isn't worth the hassle.
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12-08-2018, 12:50 PM | #8 |
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Re: Vintage air question
May be easier to put a wot switch on the pedal? Btw nova, I have everything on the motor hooked up like you suggested. Works great. Took me a little learning what to do with hptuner. But runs amazing
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12-08-2018, 12:52 PM | #9 |
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Re: Vintage air question
This is TOTALLY from memory from having looked at the instruction sheet a couple of years ago on a friend's truck, so please double-check it. But I'm a visual learner so this should be close:
On the bottom right of the Vintage wiring diagram, you'll find a manual override knob which activates a blue or white wire. That's the one you want to tie your ECM's green wire to. When the green wire goes LOW (ground signal), it will act like the manual override switch and activate the relay just like the switch would if you manually flipped it.
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12-08-2018, 12:54 PM | #10 |
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Re: Vintage air question
I went out and found the chart I was looking for, I think this is it. I was close! It's the white wite that connects to the knob, and I think the blue is equivalent.
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12-08-2018, 01:16 PM | #11 |
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Re: Vintage air question
I will give it a shot
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12-08-2018, 07:34 PM | #12 |
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Re: Vintage air question
Gunnin4ya, what year is your PCM? This make a big difference on if its doable.
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12-08-2018, 07:46 PM | #13 |
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Re: Vintage air question
2002
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01-31-2019, 01:45 PM | #14 |
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Re: Vintage air question
I have a 2008 E38 ECM and want to set it up so the ECM knows the AC is on. Is it X1-pin 63 that needs to be connected? and is it 12+ or (-)?
I can find a schematic for the AC. I am also running an Old Air products Hurricane system. http://www.lt1swap.com/E38%20ECM%20C...%20Pinouts.htm
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02-01-2019, 01:17 AM | #15 | |
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Re: Vintage air question
Quote:
This is all based on a little reading and how my BP Automotive harness was setup, so take this for what its worth. On my truck Im using Vintage Air, but the principal is the same. The standalone AC system has its own pressure switch for the compressor clutch. Since the ECM uses different voltages than what the AC clutch requires it also has a pressure switch for the ECM. Here is a picture of my LS ECM switch, I bought a port and welded to one of my aluminum lines |
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02-01-2019, 11:57 AM | #16 | |
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Re: Vintage air question
Great info and pic. Which pin needs to be hooked up to the pressure switch?
what switch do you have? 12 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal (CJ2/C67) 13 0.35 TN 5514 Low Reference (4.8L/5.3L6.0L/6.2L with CJ2/C67) -A/C Refrigerant Pressure Sensor Pin 1 63 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control (CJ2/C67) I wired a relay to turn my fans on high when the AC clutch is engaged. but would like the ECM to know the AC is switched on Quote:
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02-01-2019, 01:35 PM | #17 |
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Re: Vintage air question
ok so this is the sensor. I am guessing that the pins 12/13/34 go to it? I pulled a diagram for low V reference on LT1SWAP.COM
http://www.lt1swap.com/pictures/5-Vo...0Reference.gif https://www.amazon.com/ACDelco-15-51.../dp/B01LWENR28
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1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD* GO GO!!! Last edited by First c10; 02-01-2019 at 04:30 PM. Reason: spelling errors |
02-01-2019, 03:33 PM | #18 |
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Re: Vintage air question
12 0.35 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
13 0.35 TN 5514 Low Reference A/C Refrigerant Pressure Sensor Pin 1 34 0.35 GY/WH 2700 5-Volt Reference 1 - A/C Refrigerant Pressure Sensor Pin 2 I believe that is the right switch, matches mine. (4063) R134a Aluminum Weld-On Switch Port is the weld on port I used, search on ebay. There are also fittings you can crimp inline on a hose as well. |
02-01-2019, 04:20 PM | #19 |
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Re: Vintage air question
Thank you for the pictures I am sure I have the plug that was removed from the harness. I will have to add it back in. And remove the relay I added.
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04-07-2019, 12:18 PM | #20 |
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Re: Vintage air question
Just started to plumb the ac lines and grabbed the GM pressure switch and found out it is m10x1.0 thread pitch. I found an adapter to go from the 1/4” r12 flare (7/16-20)to m10 switch port size.
I am installing a tee one side for the binary switch and the other for the GM pressure switch to ECM. https://coldhose.com/switches/7-16-f...itch-port.html
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1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD* GO GO!!! |
05-30-2019, 12:49 AM | #21 |
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Re: Vintage air question
Follow up to this thread.
The gen 4 stuff needs a special canbus box to tell the pcm that the ac is on for the pcm to control the fans during the use of AC. So on to a trinary switch if a relay to turn on the fan when the ac calls for the ac clutch to engage.
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1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD* GO GO!!! |
06-10-2019, 01:39 PM | #22 |
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Re: Vintage air question
Sounds like this may have been figured out already but I ran across this fan harness from Painless (#30118) that might be worth sharing/asking about. It's a three relay setup and uses the stock high/low wires coming from the PCM to control when the fans come on but has a wire that splices in to the compressor wire to kick on the fans when the AC clutch is engaged. With the Vintage Air unit being separate/stand alone from engine's harness and computer, wouldn't this be good way to have the fans work like they should without complicating things with the computer? I showed this to the guys making my harness (Speartech) and they said it should work just fine but here's the wiring diagram and a pic of the harness in case anyone wants to take a look and confirm or deny.
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06-12-2019, 02:14 PM | #23 |
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Re: Vintage air question
Sounds like what you want/need is the ECU to be aware of the AC coming on/off as opposed to controlling it. Having the ECU control the AC is illogical, as you control the temperature. You want the ECU though to respond to the AC being activated. Ideally the ECU would have an input so when the compressor grounds, it knows the AC is on and adjusts idle and kicks on your radiator fans. Essentially, the ECU would be taking the place of the separate temp sensor and trinary switch you might use in a non ECU application. The ECU would then either kick on the fans via temp demanding it, or the AC demanding it.
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09-02-2022, 12:44 AM | #24 |
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Re: Vintage air question
So I’ve got it figured out and working on a Gen 4 swap with an e38.
Trucks and van OS used the ac control panel head to send a signal to the bcm and canbus to tell the ECM when the ac was on. Without this setup, the truck and van OS will not read the ac pressure transducer. Now on the Camaros, it doesn’t use this setup. All they have is a pin on the J1 connector that is a 5v ref, that goes to the ac pressure transducer and send the info back to the ecm. So you have to use a camaro OS to make it work. Find a compatible camaro OS that is also comparable with your TCM. You will also have to run a camaro accelerator pedal to use the camaro OS. It works. You then use the ac high side pressures to control when the fans come on. Got mine setup and finished today. Shoot me a email if you need some help. Nick C10clubLA@gmail.com
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