A/C & Cruize wiring help needed
Thread Starter
Teching In
Joined: Aug 2003
Posts: 44
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From: Waxahachie, TX
A/C & Cruize wiring help needed I started reworking my wiring harness for my 5.3L swap. Engine and harness is 2002. I have all the wires pulled that I don't need from both computer connectors and I started going thru the C2 under hood fuseblock connector.
I plan to eventually install air conditioning into our 1966 C10, but it will probably be an under dash unit and I plan to use the stock 5.3L A/C Compressor. There are are several wires for air conditioning built into the harness. Are any of these wires worth keeping if I plan to use an under dash unit or should I pull them out?
I also would like to use cruise control. What wiring would be necessary to keep?
Thank you,
Kevin C
I plan to eventually install air conditioning into our 1966 C10, but it will probably be an under dash unit and I plan to use the stock 5.3L A/C Compressor. There are are several wires for air conditioning built into the harness. Are any of these wires worth keeping if I plan to use an under dash unit or should I pull them out?
I also would like to use cruise control. What wiring would be necessary to keep?
Thank you,
Kevin C
Thread Starter
Teching In
Joined: Aug 2003
Posts: 44
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From: Waxahachie, TX
Problem with the LS series motors is that some compressors are variable displacement. They're designed to run at different pressures than fixed.
On the DBW cruise control, chec\k out LT1swap.com.
On the DBW cruise control, chec\k out LT1swap.com.
TECH Regular
Joined: Jan 2010
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Do you have any info on the issues with the ls series compressors, Im running a vintage air setup with the stock compressor from a 6.0 van and every now and then the compressor grabs and bogs the engine, i actually bought a new fuel pump and filter because thats what i thought the problem was.
Thread Starter
Teching In
Joined: Aug 2003
Posts: 44
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From: Waxahachie, TX
THank you,
Kevin C
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TECH Regular
Joined: Jan 2010
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I just hooked those break out cables into this.
http://www.dakotadigital.com/index.c...prod/prd49.htm
It works perfect. Good luck
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Verdad Gallardo http://www.lt1swap.com/dbw.htm
The 5 page color wiring diagram helps too. You can find that here on the diagrams/pinout thread.
The 5 page color wiring diagram helps too. You can find that here on the diagrams/pinout thread.
There are a few threads with the variable displacement compressor working with aftermarket AC systems, but it sounds like the efficiency is down.
Problem is, I cant seem to find out which vehicles have fixed vs variable displacement compressors on LS motors.
Problem is, I cant seem to find out which vehicles have fixed vs variable displacement compressors on LS motors.
Do you have any info on the issues with the ls series compressors, Im running a vintage air setup with the stock compressor from a 6.0 van and every now and then the compressor grabs and bogs the engine, i actually bought a new fuel pump and filter because thats what i thought the problem was.
TECH Enthusiast
Joined: Feb 2008
Posts: 503
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From: Ventura, Ca
If you wire the A/C outside of the PCM you will get bogging because the system has code built into the idle routine to compensate for the extra load. It does the same for the alternator and some PS pumps also. If plan on running a cam the problem only gets worse. I would not recommmend that the system be wired outside of the PCM. Most guys do it for various reasons one of them being the harness that they bought or reworked does not have the wiring built it. If you have the underhood harness and the engine harness you should be good to go. Use the factory compressor as it is wired in the system your results will be much better. The pressure switch controls a number of things on the variable compressor including the fans and idle. On the fixed compressors they work just like the factory VA unit. Also VA does not recommend using a variable compressor but comfort air used to. I have had both Sanden and GM factory compressors on a VA system. I have found the factory compressors superior to the Sandens although other people say different. The more important part of A/C is to have match components. If your system is a 134 then you should have no problems.
Huh? 02 LQ9, no AC request, Vintage Air, sanden compressor, no bogging, dont even notoice when it cycles on.
05 L59 Classic auto air, saneden compressor, no AC request (serial data), no bogging either.
Both DBW, maybe cable is different.
05 L59 Classic auto air, saneden compressor, no AC request (serial data), no bogging either.
Both DBW, maybe cable is different.
If you wire the A/C outside of the PCM you will get bogging because the system has code built into the idle routine to compensate for the extra load. It does the same for the alternator and some PS pumps also. If plan on running a cam the problem only gets worse. I would not recommmend that the system be wired outside of the PCM. Most guys do it for various reasons one of them being the harness that they bought or reworked does not have the wiring built it. If you have the underhood harness and the engine harness you should be good to go. Use the factory compressor as it is wired in the system your results will be much better. The pressure switch controls a number of things on the variable compressor including the fans and idle. On the fixed compressors they work just like the factory VA unit. Also VA does not recommend using a variable compressor but comfort air used to. I have had both Sanden and GM factory compressors on a VA system. I have found the factory compressors superior to the Sandens although other people say different. The more important part of A/C is to have match components. If your system is a 134 then you should have no problems.
TECH Regular
Joined: Jan 2010
Posts: 497
Likes: 4
If you wire the A/C outside of the PCM you will get bogging because the system has code built into the idle routine to compensate for the extra load. It does the same for the alternator and some PS pumps also. If plan on running a cam the problem only gets worse. I would not recommmend that the system be wired outside of the PCM. Most guys do it for various reasons one of them being the harness that they bought or reworked does not have the wiring built it. If you have the underhood harness and the engine harness you should be good to go. Use the factory compressor as it is wired in the system your results will be much better. The pressure switch controls a number of things on the variable compressor including the fans and idle. On the fixed compressors they work just like the factory VA unit. Also VA does not recommend using a variable compressor but comfort air used to. I have had both Sanden and GM factory compressors on a VA system. I have found the factory compressors superior to the Sandens although other people say different. The more important part of A/C is to have match components. If your system is a 134 then you should have no problems.
Im thinking prob a bad compressor.... Somehow
