A/c Problem...back To The Dealer????
Team Owner
Joined: Oct 2004
Posts: 27,420
Likes: 64
From: San Clemente CA
Just today, in 97 degrees, and after sitting for lunch for 3 hours and then starting it up, no air for almost 2 minutes! then it was not cold but just COOL, SORT OF! Wrong Answer! Got an aptmt to go back to the dealer on Thursday afternoon after i let the car sit outside in the dang hear for 2-3 hrs to REPLICATE today's situation, for crying out loud,!
And i was told this system is not the same as in my '99 Riviera! Too bad, it should be- maybe I wouldn't be having these problems now! Had my compressor changed one time in 8 years by the dealer-and they gave me a lifetime warranty to boot in the Riviera!
Anyway, we'll see how this works out on Thursday...
And i was told this system is not the same as in my '99 Riviera! Too bad, it should be- maybe I wouldn't be having these problems now! Had my compressor changed one time in 8 years by the dealer-and they gave me a lifetime warranty to boot in the Riviera!
Anyway, we'll see how this works out on Thursday...
Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 752
Likes: 0
From: Palm Harbor Florida
(hi Dino)Sal
Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 752
Likes: 0
From: Palm Harbor Florida
my "lunchdate" and exgirlfriend had just purchased a 2004 C5 black on black vert and offered a ride in her newly purchased vette. How on earth could I turn the lady down, I ask you! That's why lunch took 2-3 hours! Now my secrets out, thanks to you! Man, you guys, gotta dig into everything! 
Nothing but nothing is sacred, whew! 
Thread Starter
Burning Brakes
Joined: Feb 2007
Posts: 752
Likes: 0
From: Palm Harbor Florida
The saga continues....
I was driving from my lunchdate today-a different exgirlfriend than yesterday, A/C blowing cold when all of a sudden the air started blowing warm! the the fan started slowing down, sped up and started blowing cooler then warmer! Damn thing is possessed!
Well, tomorrow is my appointment at the dealer, I swear, this thing BETTER replicate itself and act up or I will be pi$$ed off! We'll see. I'll post the conclusion to this twilite zone story when its over.
Well, tomorrow is my appointment at the dealer, I swear, this thing BETTER replicate itself and act up or I will be pi$$ed off! We'll see. I'll post the conclusion to this twilite zone story when its over.
Pro
Joined: Jun 2005
Posts: 730
Likes: 0
From: Winter Springs FL
OK, THIS IS IT! STRAIGHT FROM THE HORSE'S MOUTH! The first thing the service writer asked was where did I keep the a/c button, on Fresh Air or Recirculate? I asked what in the world was he talking about??? I just pushed the a/c on and set the temp to 74, considering it was 94-97 outside, I figured that was low enough to get things going. Then he says, Did I read the Book? What Book? I said back. The Owner's Manual! Sure I did, two and half years ago! Now i just push the a/c switch on with it already set on 74 and that's it! WRONG ANSWER!
What I was supposed to do is set the temp at 60 degrees, hit the recirculate push button but NOT set the fan switch on high but on medium to medium-to-low position. GUESS WHAT??? IT'S WORKS!!! SO FAR, ANYWAY! FOR THE LAST 2 TIMES IT DID. I'LL GIVE IT ANOTHER 2 WEEKS AND GIVE Y'ALL ONE LAST REPORT ON THIS.
Thanks for all your technical support and all, guys, you're all great! I can't wait to go back and tell them to check their TSB book for the one that refers to the removal of excess of PHFFTS of freeon.
If that aint a classic, I don't know what is-
What I was supposed to do is set the temp at 60 degrees, hit the recirculate push button but NOT set the fan switch on high but on medium to medium-to-low position. GUESS WHAT??? IT'S WORKS!!! SO FAR, ANYWAY! FOR THE LAST 2 TIMES IT DID. I'LL GIVE IT ANOTHER 2 WEEKS AND GIVE Y'ALL ONE LAST REPORT ON THIS.
Thanks for all your technical support and all, guys, you're all great! I can't wait to go back and tell them to check their TSB book for the one that refers to the removal of excess of PHFFTS of freeon.
If that aint a classic, I don't know what is-
Thank God for the forum. I reduced my charge and the problem was solved. Thanks everyone.
Instructor
Joined: Jan 2006
Posts: 246
Likes: 4
From: Denton County Texas
The system is experiencing a high head pressure situation. The engine control module will disengage the compressor clutch at pressures above 300 kPa (435 psi) for safety. Any time the compressor is off, the HVAC control head will return the system to outside air from recirculation mode to reduce interior cabin noise, unless the customer has manually selected recirculation mode. The sound level difference is often mistaken for a change in blower speed.
This condition is most likely seen on a hot engine re-start such as after a gas station stop, prolonged low speed driving, or vehicle idling at an elevated ambient condition. The initial spike in head pressure may be enough to disengage the compressor clutch. If the vehicle has any forward motion, the system will recover within seconds. If the vehicle is stationary or in a significant tail wind, the system can take minutes to recover after a disengagement
After verifying that the vehicle's refrigerant pressure sensor is working properly, the solution is to reduce the refrigerant charge level from 0.64 kg (1.4 lbs.) to a new charge of 0.50 kg (1.10 lbs).
This condition is most likely seen on a hot engine re-start such as after a gas station stop, prolonged low speed driving, or vehicle idling at an elevated ambient condition. The initial spike in head pressure may be enough to disengage the compressor clutch. If the vehicle has any forward motion, the system will recover within seconds. If the vehicle is stationary or in a significant tail wind, the system can take minutes to recover after a disengagement
After verifying that the vehicle's refrigerant pressure sensor is working properly, the solution is to reduce the refrigerant charge level from 0.64 kg (1.4 lbs.) to a new charge of 0.50 kg (1.10 lbs).
Drifting
Joined: Jun 2002
Posts: 1,303
Likes: 151
From: Las Vegas Nevada
Exactly what mine did...
I live in Las Vegas (HOT). My 05 C6's A/C has been great with one exception. I was driving south on I15 from Nellis towards town about noon for a doctors apt. My outside air temp showed 113. About 2 miles from my exit, traffic stopped due to an accident. Sat/crept along for the next 45 minutes. I was sitting there being grateful for the great A/C when the hot air started blowing. Had to shut down the A/C and open the windows. After the doctors apt and moving along at speed the A/C came back and has worked great since. High pressure is what I assumed due to the high outside air temp and no movement on the road.
My question - if I have the R-134 reduced to 1.1# (or let out a bit myself) will the A/C work less well when not in extreme heat that causes high pressure switch to turn off the compressor?
I think it will and will probably leave well enough alone and hope to not get stuck in traffic at 100 degrees +, so I think I will leave well enough alone.
In response to some of the posts above - I think that if you have digital climate control, you should not have to select 60 degrees and no-recirculation for a while and then set another temp later down the road. I set 72 or 74 and get quick cooling and a comfortable cabin temp for the rest of the trip.
My question - if I have the R-134 reduced to 1.1# (or let out a bit myself) will the A/C work less well when not in extreme heat that causes high pressure switch to turn off the compressor?
I think it will and will probably leave well enough alone and hope to not get stuck in traffic at 100 degrees +, so I think I will leave well enough alone.
In response to some of the posts above - I think that if you have digital climate control, you should not have to select 60 degrees and no-recirculation for a while and then set another temp later down the road. I set 72 or 74 and get quick cooling and a comfortable cabin temp for the rest of the trip.
Team Owner
Joined: Feb 2000
Posts: 53,529
Likes: 77
From: Arizona
My question - if I have the R-134 reduced to 1.1# (or let out a bit myself) will the A/C work less well when not in extreme heat that causes high pressure switch to turn off the compressor?
I think it will and will probably leave well enough alone and hope to not get stuck in traffic at 100 degrees +, so I think I will leave well enough alone.
I think it will and will probably leave well enough alone and hope to not get stuck in traffic at 100 degrees +, so I think I will leave well enough alone.
Here in Havasu my A/C works fine all the time with less freon. However, we don't have much in the way of rush hour traffic here.
The easy way out is to let out a small amount of freon on your own, then see if it ever happens again. I let out two short PHFFTs and the problem went away. Only months later when I brought the car in for other reasons, did I have the dealer do the official TSB.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
I had this problem for the first time this week (I rarely have my top up or ac on but did this week and had the problem). Took this post to my dealer, they did exactly as the notice said, no arguments, and it works great now.Thanks!!
