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Reverend Red Bull
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Discussion Starter #1
Experienced something a couple weeks back on my Cruze, then a member in the Facebook group mentioned it today, and I was able to answer them based on my experience, so I thought it might be worth getting out here on the forum as well:

What Happened: On a 10 mile drive home after getting groceries, I had gotten into a sun-warmed car, turned on the A/C as I drove away, but 4 miles into the drive, I noticed that the vehicle was not cooling, and it felt like just regular outside air coming through the vents. I tried using the AC switch and the outside air/recirculate switch, but nothing happened when I pressed either. I could change fan speeds and vent selection, but I noticed that nothing displayed on my MyLink screen when I did so, like any HVAC changes typically do. In the past, I have seen intermittent problems come and go from an engine restart, so I decided to pull over, shut down the car (including opening the door and removing the key to kill the retained accessory power and put the BCM to sleep), and see what happens. When I restarted the engine, all of the HVAC commands I had given prior to shutting off the ignition quickly flashed across the MyLink screen in a matter of 5 seconds, and everything worked fine.

My Theory: With all of the computer control in these vehicles, everything runs through the BCM (or another on-board computer) like HVAC, lighting, radio, locks, windows, etc. so just like your home computer sometimes fouls up and needs a reboot, so does the car. I think a lot of problems that appear occasionally correct themselves this way, and it's probably something we will get used to over time, just like rebooting home computers once in a while. I've run across this with Transmission Control Modules on my Jeep and one of my old Luminas, but now it seems to be something to watch for with interior systems and controls as well.
 

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Reverend Red Bull
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1,017 Posts
Discussion Starter #2
Since someone might ask, the guy on the FB group had an LTZ, and mine is a Diesel, (both 2014) so this seems to cover both the automatic and the manual HVAC controls.
 

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Premium Member
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7,786 Posts
When I restarted the engine, all of the HVAC commands I had given prior to shutting off the ignition quickly flashed across the MyLink screen in a matter of 5 seconds, and everything worked fine.
Interesting. So the controls "saw" your input, but was waiting on something else. I wonder what it was waiting for? (And it remembered your commands even though you powered everything off.)
 

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Interesting. So the controls "saw" your input, but was waiting on something else. I wonder what it was waiting for? (And it remembered your commands even though you powered everything off.)
My Malibu locked up the OnStar Module and I hit buttons and tried to dial with Bluetooth for 5 minutes. When it unlocked itself every command I had done occurred and I couldn't get Ms Bluetooth to STFU for a few minutes. It dialed my home number at least 10 times. Funny to say the least.

Also the HVAC controller is a programmable module so it could be IT that locked up. Excuse me for using Brian's IT. Not sure if it is copyrighted.
 

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It would be nice if these automotive OSs would throw some sort of error message (even BSOD) when they crashed. I guess they are too rudimentary to do that sort of thing. When all else fails, REBOOT!
 

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Sounds like the HVAC module halted on a command and just ran in a loop un-able to execute the further commands in cache, shutdown of the system restarts the whole processor loop and gets past the lockup, could be code glitch-buggy code or possibly some other module requesting data--like the bus master BCM, also could have been momentary erroneous data out of one of the sensors on the HVAC system--actuators, temp etc., I'm sure the door sensors in the HVAC system are not going to be industrial quality and a piece of dust or lint could easily cause a problem
 

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This has happened to me before, as well. I realized it wasn't cooking sitting at the stop light after leaving my house, about a mile back. I turned off the car at the light and opened the door. Turned the car back on, and everything worked fine. Its only happened once in 52,000 miles, at least.
 
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