Conversions & Swaps LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

a/c wiring question

Thread Tools
 
Search this Thread
 
Old Aug 3, 2011 | 04:44 AM
  #1  
LS1MCSS's Avatar
Thread Starter
TECH Junkie
iTrader: (18)
 
Joined: Jan 2006
Posts: 3,831
Likes: 8
From: Dover, Arkansas
Default a/c wiring question

I'm putting a 5.3 in my 85 Monte Carlo SS and will be using the a/c. If I hook up the a/c request wire from the pcm like it should be, will that make my fan come on when I turn on the a/c? I'm using a 99-02 f-body harness and f-body pcm.
Reply
Old Aug 3, 2011 | 07:27 AM
  #2  
garys 68's Avatar
TECH Junkie
15 Year Member
Photogenic
iTrader: (1)
 
Joined: Dec 2007
Posts: 3,724
Likes: 39
From: Camdenton, MO
Default

My understanding is that AC functions are dependent on the f body pressure sensor.
I just used a trinary switch to control one fan.
Reply
Old Aug 3, 2011 | 09:06 AM
  #3  
TomM's Avatar
TECH Resident
15 Year Member
Photogenic
Liked
Loved
iTrader: (57)
 
Joined: Feb 2009
Posts: 857
Likes: 31
From: Baytown, Texas
Default

Yes, it should, that is how mine is wired, and it brings both fans on when compressor clutch gets 12 volts....

T,

Last edited by TomM; Aug 3, 2011 at 11:16 AM.
Reply
Old Aug 3, 2011 | 09:33 AM
  #4  
LS1MCSS's Avatar
Thread Starter
TECH Junkie
iTrader: (18)
 
Joined: Jan 2006
Posts: 3,831
Likes: 8
From: Dover, Arkansas
Default

Originally Posted by garys 68
My understanding is that AC functions are dependent on the f body pressure sensor.
I just used a trinary switch to control one fan.
The pcm controls the a/c on an f-body system, but I have a g-body. My compressor is a fix displacement Sanden and the pcm doesn't have any control over it.
Reply
Old Aug 3, 2011 | 09:35 AM
  #5  
LS1MCSS's Avatar
Thread Starter
TECH Junkie
iTrader: (18)
 
Joined: Jan 2006
Posts: 3,831
Likes: 8
From: Dover, Arkansas
Default

Originally Posted by TomM
Yes, it should, that is how mine is iwred, and it brings both fans on when compressor clutch gets 12 volts....

T,
Thanks, That's what I wanted to hear. I want everything possible to be completly automatic on this car. I didn't want to have to wire in another relay to the a/c system just to make sure the fans come on.
Reply
Old Aug 3, 2011 | 10:06 AM
  #6  
the_merv's Avatar
11 Second Club
Veteran: Air Force
20 Year Member
Loved
Community Favorite
iTrader: (88)
 
Joined: Mar 2006
Posts: 21,019
Likes: 893
From: The Beach...
Default

You are the wiring guru...


The PCM is setup to turn the Fans on when the AC comes on..that's a default setting. You can adjust it with HP Tuners..as in what temp you want them to come on when you turn the AC on.
Reply
Old Aug 3, 2011 | 11:19 AM
  #7  
LS1MCSS's Avatar
Thread Starter
TECH Junkie
iTrader: (18)
 
Joined: Jan 2006
Posts: 3,831
Likes: 8
From: Dover, Arkansas
Default

I'm getting closer to having it running. I didn't like my gauge setup so I changed that last night. They are a lot easier to see now. I have my exhaust system, but it's still laying in the corner. I just need to get it put on, get a drive shaft cut, and do a little more wiring and I could start it. It sure looks a lot better with the fresh paint.

Reply
Old Aug 3, 2011 | 11:38 AM
  #8  
the_merv's Avatar
11 Second Club
Veteran: Air Force
20 Year Member
Loved
Community Favorite
iTrader: (88)
 
Joined: Mar 2006
Posts: 21,019
Likes: 893
From: The Beach...
Default

Yea..it's coming along..
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-1

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-2

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-3

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-4

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-5

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-6

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-7

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-8

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-9

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
Old Aug 4, 2011 | 12:25 AM
  #9  
G-Body's Avatar
sawzall wielding director
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (4)
 
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Default

The PCM will engage the fans and bump the idle up as long as pin#17 red sees a 12v signal and red pin #55 sees a ground signal.
Reply




All times are GMT -5. The time now is 04:10 AM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-5
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-6
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-7
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-8
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-9
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE