C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Strange AC Issue

Thread Tools
 
Search this Thread
 
Old Jun 12, 2010 | 02:06 PM
  #1  
Skymac's Avatar
Skymac
Thread Starter
Heel & Toe
 
Joined: Mar 2008
Posts: 24
Likes: 0
From: Bowling Green KY
Default Strange AC Issue

Anyone got any ideas on why I only get cool air out of the two passenger vents and passenger side defrost vent? Just ambient temp air comes out of the driver side and center vent when the A/C is on.

If you turn the heat on then heat comes out of all vents like normal, but when A/C is on only out of the left side vents... Im stumped but im sure its something simple. Flow also changes when I select bottom vents, etc like normal.

Thanks
Reply
Old Jun 12, 2010 | 04:02 PM
  #2  
Rohan's Avatar
Rohan
Burning Brakes
Supporting Lifetime
Veteran: Army
Veteran: Air Force
15 Year Member
 
Joined: Dec 2009
Posts: 963
Likes: 23
Default

If you turn the heat on then heat comes out of all vents like normal, but when A/C is on only out of the left side vents... Im stumped but im sure its something simple. Flow also changes when I select bottom vents, etc like normal.

Thanks[/QUOTE]


I have the same exact problem. Hopefully someone will help us out here.
Reply
Old Jun 12, 2010 | 05:08 PM
  #3  
chris308's Avatar
chris308
Melting Slicks
15 Year Member
 
Joined: Sep 2006
Posts: 2,721
Likes: 104
From: Florida
Default

same issue here, and i'm about 98.76% sure it's a vacuum line issue, just haven't looked at mine yet.
Reply
Old Jun 12, 2010 | 06:58 PM
  #4  
byronhunter's Avatar
byronhunter
Melting Slicks
15 Year Member
All Eyes On Me
 
Joined: Oct 2007
Posts: 2,383
Likes: 13
From: Kinston North Carolina
Default

You've got 2 choices, Actuator problem, (check for codes), or low on Refrigerant. Do a search for this problem, must have been discused 100 times before.
Reply
Old Jun 12, 2010 | 07:15 PM
  #5  
Skymac's Avatar
Skymac
Thread Starter
Heel & Toe
 
Joined: Mar 2008
Posts: 24
Likes: 0
From: Bowling Green KY
Default

Well it's ice cold on the right so doubt it's low.. I'll check for codes
Reply
Old Jun 12, 2010 | 08:18 PM
  #6  
SebringSixSpeed's Avatar
SebringSixSpeed
Burning Brakes
 
Joined: May 2007
Posts: 1,078
Likes: 5
From: Denver, North Carolina
Default

Originally Posted by Skymac
Well it's ice cold on the right so doubt it's low.. I'll check for codes
I know its very strange to have the cold air on the pass side and be low on refridgerant but let me assure you that it's completely possible and inherent to the design of the vettes a/c system. I have personally been through this issue so let me try to explain how it happens. The low level of freon can still have just enough energy as it enters the evaporator to create a cooling effect on the first half of the evaporator but it's energy is not strong enough to cool the entire thing. So think of half of the evaporator getting cold and the other half basically not being affected because the refridgerant has lost all it's energy due to the low level. Now consider that the passenger side vents are taking air from the first half of the evaporator and the drivers side vents are getting the ambient temp air from the second half of the evaporator that has not become chilled.

I wrestled with this idea for awhile until I hooked up my gauges and added freon until I got about 290 psi on the high side and whadda ya know, ice cold air on the drivers side to go along with the cold air on the passenger side - believe it.

Last edited by SebringSixSpeed; Jun 12, 2010 at 09:49 PM.
Reply
Old Jun 12, 2010 | 09:01 PM
  #7  
byronhunter's Avatar
byronhunter
Melting Slicks
15 Year Member
All Eyes On Me
 
Joined: Oct 2007
Posts: 2,383
Likes: 13
From: Kinston North Carolina
Default

SebringSixSpeed has got it Exactly right!!!!!!!!!! It does also happen to other GM cars, ask Me how I know.
Reply
Old Jun 12, 2010 | 09:59 PM
  #8  
rebelheart's Avatar
rebelheart
Safety Car
 
Joined: May 2008
Posts: 4,237
Likes: 11
From: Lacombe Louisiana
Default

This is pretty common,you most likely are a bit low on freon.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Jun 13, 2010 | 12:25 AM
  #9  
Skymac's Avatar
Skymac
Thread Starter
Heel & Toe
 
Joined: Mar 2008
Posts: 24
Likes: 0
From: Bowling Green KY
Default

290 at idle?


It's at 195 at idle now...
Reply
Old Jun 13, 2010 | 08:56 AM
  #10  
SebringSixSpeed's Avatar
SebringSixSpeed
Burning Brakes
 
Joined: May 2007
Posts: 1,078
Likes: 5
From: Denver, North Carolina
Default

No, 290 psig at approximately 2000 rpm (servicing a/c at idle can be frustrating). but that was for my ambient temp and humidity. Hot and humid. For reference, if you have a 90 degree F day and 80% humidity, at idle you should have about 225 psig on the high side. If you rev it up to around 2000 rpm the pressure will go up. If you don't think its the freon level go ahead and put a new actuator in like I did, then when you still have the same problem add the freon. Those are the only two causes of the simultanious warm/cold condition.

Reply
Old Jun 13, 2010 | 09:06 PM
  #11  
C5 Corvette C5's Avatar
C5 Corvette C5
Advanced
 
Joined: May 2009
Posts: 62
Likes: 0
From: Wisconsin
Default

Originally Posted by Skymac
Anyone got any ideas on why I only get cool air out of the two passenger vents and passenger side defrost vent? Just ambient temp air comes out of the driver side and center vent when the A/C is on.

If you turn the heat on then heat comes out of all vents like normal, but when A/C is on only out of the left side vents... Im stumped but im sure its something simple. Flow also changes when I select bottom vents, etc like normal.

Thanks
Yea I have the same problem. Got any ideas yet of what it is?
Reply
Old Jun 13, 2010 | 09:21 PM
  #12  
SebringSixSpeed's Avatar
SebringSixSpeed
Burning Brakes
 
Joined: May 2007
Posts: 1,078
Likes: 5
From: Denver, North Carolina
Default

Originally Posted by C5 Corvette C5
Yea I have the same problem. Got any ideas yet of what it is?
Reply
Old Jun 14, 2010 | 09:17 AM
  #13  
Rohan's Avatar
Rohan
Burning Brakes
Supporting Lifetime
Veteran: Army
Veteran: Air Force
15 Year Member
 
Joined: Dec 2009
Posts: 963
Likes: 23
Default

Low freon was my problem. Would have never thought to check that first. THANKS GUYS!!!
Reply
Old Jun 14, 2010 | 11:41 AM
  #14  
rebelheart's Avatar
rebelheart
Safety Car
 
Joined: May 2008
Posts: 4,237
Likes: 11
From: Lacombe Louisiana
Default

Beats tearing down the dash doesnt it?!
Reply
Old Jun 14, 2010 | 01:02 PM
  #15  
Skymac's Avatar
Skymac
Thread Starter
Heel & Toe
 
Joined: Mar 2008
Posts: 24
Likes: 0
From: Bowling Green KY
Default

Well I haven't taken down the system yet, will probably do that soon though.. I mean if its low, then its low for a reason of course so I want to find the reason instead of just masking the problem. This is all great information and thanks for the help.
Reply
Old Aug 2, 2010 | 09:07 PM
  #16  
883stump's Avatar
883stump
Heel & Toe
 
Joined: Jan 2010
Posts: 24
Likes: 0
From: ky
Default

I am having the same prob.... I am told its low on refridgerent also, even though I had it checked and I was told its was fine, I have to believe its low on freon, cause i am told this system is finiky and can be to high one way and to low the other and it can cause this problem..... I will try to add some freon and see what happens......
Reply
Old Aug 9, 2010 | 05:57 PM
  #17  
Pie R Squared's Avatar
Pie R Squared
Burning Brakes
25 Year Member
All Eyes On Me
 
Joined: Apr 2000
Posts: 824
Likes: 4
From: San Diego CA
Default

Check to see if you have green oil (it's PAG with dye) leaking from under your car, if so then the AC compressor is going bad.
Reply

Get notified of new replies

To Strange AC Issue





All times are GMT -4. The time now is 04:34 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE