Air conditioner problem, Any ideas?
Thread Starter
Instructor
Joined: Jun 2010
Posts: 125
Likes: 0
From: Fort Worth Texas
Air conditioner problem, Any ideas?
I searched the forum but have not found any answers so im hoping someone here can help before I have to go to the dealership. While sitting idle at the post office yesterday the air conditioner began blowing hot air, after i pulled back out on the roadway the air conditoner began blowing ice cold again. It has blown warm in the past while going down the road but always comes back ice cold again really quickly. I checked the coolant level with a gauge and it shows fine but it sounds like the compresser kicks off and on. turned off the car and restarted it and ice cold again. Any ideas? Im not sure if its the compresser or the hvac control unit or maybe something else? I have had the flashing numbers on the hvac control unit a long time ago leading me to believe its that but im not sure. Any help would be greatly appreciated before i go throwing money at gueses.
Thanks
Brandon
Thanks
Brandon
Melting Slicks
Joined: Jul 2007
Posts: 2,063
Likes: 17
From: Lee's Summit MO
You said you checked the coolant level. Did you mean refrigerant level?
If so, you might also want to check your engine anti-freeze/coolant. If it's low, it can cause A/C to blow hot air.
If so, you might also want to check your engine anti-freeze/coolant. If it's low, it can cause A/C to blow hot air.
Le Mans Master
Joined: Mar 2010
Posts: 7,050
Likes: 945
From: DFW TX
Btw. My car has done this a few ties but it's the actual hvac controls that turned it off. I think it happened when my phone rang believe it or not. I just turned it back on. Really sounds like the fans. Driving would mask fan issues
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
The software/firmware is designed to start shutting things off if the voltage level drops significantly. You might want to monitor the battery voltage if this happens again. How old is your battery?
Le Mans Master
Joined: Mar 2010
Posts: 7,050
Likes: 945
From: DFW TX
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Thread Starter
Instructor
Joined: Jun 2010
Posts: 125
Likes: 0
From: Fort Worth Texas
The battery is about 3 months old and seems to be doing great, car is an 05 auto so couldn't be the clutch. The temp reading seems to be ok I have in the past had it say the wrong thing and not blow correctly but right now it seems to be right on. I'm sitting at prep boys right now letting them run a diagnostic on the ac system. If nothing else for 30 dollars maybe they can tell me what is working and whats not. Ie: compressor, correct refrigerant level.. Heres hoping!
Pro
Joined: Nov 2007
Posts: 545
Likes: 3
From: Cypress TX
Have you see this thread? Some 05's shipped with too much R134.
http://forums.corvetteforum.com/c6-c...e-factory.html
Steve
http://forums.corvetteforum.com/c6-c...e-factory.html
Steve
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
I see your in Texas....and you know how hot it is down here right now.
I can tell you from daily driving mine in the heat the last few months....it has done similar to me.
Generally leaving the shop in the afternoon it will take it a little bit to cool off but as long as I'm running down the road it stays cool, and most of the time auto/re-circ mode. If you pull it out of that into fresh air mode it will warm up slightly.
Sitting in traffic on the tollway or side streets for long periods of time it will start to warm up. Only time I have had it blow warm on me was running the car a bit harder, and it will shut off WOT of course, and also if the car starts to run to hot coolant temp wise (say 225+). If the car is hot and it can not suck in enough air to cool off the condenser and the radiator it will shut the A/C off. As others have said as well there is a voltage/stall saver that will kill items to protect battery life and it will also kill the A/C and/or alternator to keep the car from stalling.
I can tell you from daily driving mine in the heat the last few months....it has done similar to me.
Generally leaving the shop in the afternoon it will take it a little bit to cool off but as long as I'm running down the road it stays cool, and most of the time auto/re-circ mode. If you pull it out of that into fresh air mode it will warm up slightly.
Sitting in traffic on the tollway or side streets for long periods of time it will start to warm up. Only time I have had it blow warm on me was running the car a bit harder, and it will shut off WOT of course, and also if the car starts to run to hot coolant temp wise (say 225+). If the car is hot and it can not suck in enough air to cool off the condenser and the radiator it will shut the A/C off. As others have said as well there is a voltage/stall saver that will kill items to protect battery life and it will also kill the A/C and/or alternator to keep the car from stalling.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
I see your in Texas....and you know how hot it is down here right now.
I can tell you from daily driving mine in the heat the last few months....it has done similar to me.
Generally leaving the shop in the afternoon it will take it a little bit to cool off but as long as I'm running down the road it stays cool, and most of the time auto/re-circ mode. If you pull it out of that into fresh air mode it will warm up slightly.
Sitting in traffic on the tollway or side streets for long periods of time it will start to warm up. Only time I have had it blow warm on me was running the car a bit harder, and it will shut off WOT of course, and also if the car starts to run to hot coolant temp wise (say 225+). If the car is hot and it can not suck in enough air to cool off the condenser and the radiator it will shut the A/C off. As others have said as well there is a voltage/stall saver that will kill items to protect battery life and it will also kill the A/C and/or alternator to keep the car from stalling.
I can tell you from daily driving mine in the heat the last few months....it has done similar to me.
Generally leaving the shop in the afternoon it will take it a little bit to cool off but as long as I'm running down the road it stays cool, and most of the time auto/re-circ mode. If you pull it out of that into fresh air mode it will warm up slightly.
Sitting in traffic on the tollway or side streets for long periods of time it will start to warm up. Only time I have had it blow warm on me was running the car a bit harder, and it will shut off WOT of course, and also if the car starts to run to hot coolant temp wise (say 225+). If the car is hot and it can not suck in enough air to cool off the condenser and the radiator it will shut the A/C off. As others have said as well there is a voltage/stall saver that will kill items to protect battery life and it will also kill the A/C and/or alternator to keep the car from stalling.
Pro
Joined: Aug 2010
Posts: 748
Likes: 3
Check the fan connector plug. If it is melted it may not be controlling the fan correctly, and when you start driving the airflow across the condenser cools things down, hence the warm condition when stopped but not while driving.
Melting Slicks
Joined: Sep 2007
Posts: 2,597
Likes: 3
From: READING PA
St. Jude Donor '08-'09-'10
A/c problems
What did the folks at PEP BOYS say. They should have checked the Charge High & LO Pressures when the compressor is running. From what I am hearing here it seems like a intermittent here. There are several things that will make the Compressor drop out. Unfortunately they dont show up as cel's but as conditions that go away when the sys returns to normal.
Can you tell me this.
1. When you get the hot air does the a/c light and fan indicator turn off ?
2. When the warm air comes and you pull over can you hear the fan running ?
Can you tell me this.
1. When you get the hot air does the a/c light and fan indicator turn off ?
2. When the warm air comes and you pull over can you hear the fan running ?
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Have you see this thread? Some 05's shipped with too much R134.
http://forums.corvetteforum.com/c6-c...e-factory.html
Steve
http://forums.corvetteforum.com/c6-c...e-factory.html
Steve
Dealer started to fight me about it until I printed out the tsb and once they did the work, it's been fine for 5 years now.
Safety Car
Joined: Nov 2007
Posts: 4,433
Likes: 873
From: Bay Area CA
Recently, I have experience the A/C all of a sudden blow warm air and the recirculation light would go off. I would press the " no a/c fan only " button on and off with no difference in temp. I then turned the A/C off, waited a few minutes and turned it back on and it worked. This occurred during 90 degree F temps, freeway driving, cooling fluid full, fan working, engine coolant temps 192- 198 and no other issues. Additionally, I have no battery issues or voltage drop issues, stock tune, no mods. It sounds like there is a faulty relay switch or pressure switch that is faulty? Thanks for any suggestions or help!
Last edited by Mike's LS3; Aug 28, 2011 at 01:10 AM.
