Climate Control Issue
Thread Starter
Intermediate
Joined: Aug 2008
Posts: 27
Likes: 0
From: Chattanooga Tennessee
Climate Control Issue
Today, I took my 2005 C6 in for a re-flash because of DBS. It was about 68 degrees this afternoon when I left the dealer, so I did not notice anything different about the climate control.
I took the car out for a long drive tonight, and the upper vents were discharging outside temperature air - 42 degrees. The system is set on auto, with the a/c compressor off. The lower vents were discharging warm air.
I keep the temperature between 70 - 72 degrees, and it has been perfect. Now, the system will freeze my face & torso while warming my feet. This is quite aggravating, since the climate control system worked beautifully before the re-flash. It used to provide slightly cooler air from the upper vents, while discharging heat to the lower ones.
Do you guys think that the re-flash (PIC4188E) screwed up my climate control? Now, the system will not discharge any warm air from the upper vents until the temperature is dialed up to 80 - 85 degrees, and then the inside temp of the car is soon too warm. Any suggestions would be greatly appreciated!
I took the car out for a long drive tonight, and the upper vents were discharging outside temperature air - 42 degrees. The system is set on auto, with the a/c compressor off. The lower vents were discharging warm air.
I keep the temperature between 70 - 72 degrees, and it has been perfect. Now, the system will freeze my face & torso while warming my feet. This is quite aggravating, since the climate control system worked beautifully before the re-flash. It used to provide slightly cooler air from the upper vents, while discharging heat to the lower ones.
Do you guys think that the re-flash (PIC4188E) screwed up my climate control? Now, the system will not discharge any warm air from the upper vents until the temperature is dialed up to 80 - 85 degrees, and then the inside temp of the car is soon too warm. Any suggestions would be greatly appreciated!
Team Owner
Joined: Sep 2000
Posts: 25,015
Likes: 2,709
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Did you manually turn the AC compressor off? I think the system is designed to run with it on, or perhaps I should say the system should makes its own decision about the compressor.
I only disable my compressor for racing, climate control and gas mileage both keep me happy the rest of the time.
Is it also possible that the reflash alters the programming for the AC system?
I only disable my compressor for racing, climate control and gas mileage both keep me happy the rest of the time.
Is it also possible that the reflash alters the programming for the AC system?
Last edited by Gearhead Jim; Dec 30, 2008 at 10:28 AM.
Thread Starter
Intermediate
Joined: Aug 2008
Posts: 27
Likes: 0
From: Chattanooga Tennessee
Thanks for the replies guys!
Jim
Yes, I hit the AC button to turn off the compressor. The system has always worked fine like this in the past - until yesterday. With the AC compressor engaged, the air was even colder!
It is possible that the re-flash had something to do with this change, but the dead battery & my actions afterward may have caused it. When I put the charger on the battery, the drivers window would lower a small amount every time the drivers door was opened. The car was outside, so I finally re-indexed the window with the charger hooked up.
I hit the bottom of the ignition switch to place the ignition in accessory mode - in order to index the windows. I do remember hearing a noise behind the dash while accessory mode was engaged. This noise could possibly have been a control door motor for the climate control trying to actuate, but I do not know for sure. Possibly, an actuator or door is stuck, and needs to be re-indexed.
The battery was out of the car for two hours before taking it to the dealership for the re-flash, so disconnecting and reconnecting the batter will probably not have an effect - but I will try it anyway.
Jim
Yes, I hit the AC button to turn off the compressor. The system has always worked fine like this in the past - until yesterday. With the AC compressor engaged, the air was even colder!
It is possible that the re-flash had something to do with this change, but the dead battery & my actions afterward may have caused it. When I put the charger on the battery, the drivers window would lower a small amount every time the drivers door was opened. The car was outside, so I finally re-indexed the window with the charger hooked up.
I hit the bottom of the ignition switch to place the ignition in accessory mode - in order to index the windows. I do remember hearing a noise behind the dash while accessory mode was engaged. This noise could possibly have been a control door motor for the climate control trying to actuate, but I do not know for sure. Possibly, an actuator or door is stuck, and needs to be re-indexed.
The battery was out of the car for two hours before taking it to the dealership for the re-flash, so disconnecting and reconnecting the batter will probably not have an effect - but I will try it anyway.
Melting Slicks
Joined: May 2006
Posts: 2,324
Likes: 0
From: MN
The reflash didn't do anything to the HVAC system - totally separate. It's either a little gremlin that a reboot by disconnecting the battery will resolve, or it's a new issue with the HVAC system. Try disconnecting the battery again and checking it. If it's still there, then it will likely be a bad sensor or something. I don't see any bulletins on this specific issue, so good luck.
Team Owner
Joined: Jul 2004
Posts: 40,404
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From: Redondo Beach, California
Team Owner
Joined: Feb 2000
Posts: 53,524
Likes: 77
From: Arizona
DBS is 'dreaded battery syndrome'. In reference to '05 MN6 cars that had unexplained sudden dead batteries despite proper shutdown. A variant also affected a few early '06's. The reflash is for the BCM, body control module.
Moderator
Joined: Feb 2006
Posts: 39,116
Likes: 17,973
From: DFW Area TX
DBS = Dead Battery Syndrome, which is probably dreaded by 2005 MN6 owners.
From a GM communication:
From a GM communication:
Hello Everyone: I'm sure most of you do not know each other but you are all Corvette enthusiast that I have been communicating with regarding your dead battery syndrome. I just wanted to give everyone an update so you know where we stand. I was off on vacation in November and December but rest assured the project is moving forward.
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Melting Slicks
Joined: May 2006
Posts: 2,324
Likes: 0
From: MN
A second DBS issue came up in 2006's, and it affected both MN6's and A6's. Again, a programming error in the BCM left it running, and another reflash was needed to fix it. My 2006 A6 had 3 attacks of it before GM released the second reflash.
Thread Starter
Intermediate
Joined: Aug 2008
Posts: 27
Likes: 0
From: Chattanooga Tennessee
Problem solved!!
Pulling the battery negative cable and replacing it a few minutes later correctly reset my HVAC. Thank goodness, it now functions normally.
Thanks again for all the kind suggestions.
Pulling the battery negative cable and replacing it a few minutes later correctly reset my HVAC. Thank goodness, it now functions normally.
Thanks again for all the kind suggestions.
Drifting
Joined: Jul 2007
Posts: 1,454
Likes: 4
From: Massapequa NY
