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Date: Mon, 15 May 2000 23:33:41 -0500
From: <>
Subject: Re: 9-5 Rear Seat A/C Vents Blow Hot

Thanks to all for your extremely helpful suggestions! I will now inflict a sheaf of solutions on my dealer in the hope that one of them will carry me and my rear A/C vents coolly through the summer months ... --TR Rob Levandowski <> wrote in message > In article <8fl762$ta3$>, > <> wrote: > > >I have a '99 9-5 whose rear seat vents on the center console decided today > >to begin blowing hot air with the A/C on. Feels like the vents below the > >front seats are doing the same. The front vents continue to blow cold air, > >however. As a Texas resident entering the summer furnace months, I wasn't > >too pleased with this new development -- nor were my backseat passengers. > >Anybody else had run-ins with balky rear A/C vents? I'd like some anecdotal > >solutions to offer my well-meaning but hapless dealer here. Thanks! > > I had this problem, and my dealer applied a flash ROM update to the A/C > system. I haven't had a recurrence since, but the weather hasn't > settled into the middle temperatures where the problem became most > noticeable. > > I did find that when the problem occurred, you could usually fix it by > cycling through each mode of operation -- defrost, dash vents, floor > vents, and the combinations thereof -- and remaining in each mode for a > few seconds before changing it, then cycling the system off, waiting a > few seconds, and pressing AUTO. This seemed to reset the mixer doors > and reboot the A/C so it would work properly until it got confused > again. It seemed most prone to the problem on moderate days (60F - > 75F) on prolonged trips. > > -- > Rob Levandowski >

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