Thanks for this, I'll try it today! And get back to report.

OK I just had a look inside the engine compartment fuse box, and the only alpha words printed anywhere were OMRON over and over. No way to select a HVAC/ECAS fuse. Even viewing the rear seat fuse box is a shop job with my bad back, plus my manual gives tricky directions for re-installing the back seat belts. I bet they all say OMRON anyway. Speaking of the manual, the AC-related fuses go like this:
FRONT:
Fuse #26, AC Clutch
Relay #32 AC Clutch
#37 Cooling Fan 1
#39 Cooling Fan Series/Parallel
Fuse #46 Cooling Fan 1
#47 Cooling Fan 2
REAR
Fuse #2 Heater, Ventilation, AC Blower
#11 Ventilation Solenoid
#33 Heating, Ventilation, AC
#37 HVAC Battery

I mean, WTF!?

I think the battery disconnect will be so much easier... if only the battery was in a normal place that didn't need seat belt crapola.

Sorry you were not able to find that under the hood, the fuse may be where the rear seat fuse box is, from what I read it sounded like it was under the hood though, I seen a pic of c cover that showed the fuses, and I seen HVAC/ECAS on the cover, but the cover looked like a cover from a fuse box that is inside of the car.
Sounds like disconnecting the battery is going to be your easiest method, hopefully that helps.

I see Tech II is checking out the thread, maybe he can provide a little better help on the HVAC fuse location for your car.

Thanks, yup maybe someone else can figure out just which fuse out of so many related would be the one to pull. That would still be better than a battery reset.

p.*. why does this site keep logging me out?

I am not totally sure, but if I had to guess I'd say the fuse is #37 HVAC Battery, but I am just guessing, hopefully somebody that knows Bonnevilles a bit better than I do can offer some help as to which fuse, and where it is located.
Pulling the battery cable will work, but disconnecting the battery is the last thing I like to do, as a few things have to be relearned by the PCM when you do so.

As for the site logging you out, it is probably your cookie preferences, which browser are you using?

I just searched on Bonneville HVAC Battery and there'* enough stuff to think you're right to guess it. Also, I'll take another look inside the fusebox covers because when I looked before I just looked at the fuses...
This is with Firefox 26, with the cookies set to persist until manually deleted. I am a cookie monster, know a lot about them. Also, this is after logging in and then not moving away from the page at all, just going for lunch, errands, whatever. I suspect it'* like some other sites that will time you out for inactivity, like the server-meisters can't handle extra lurkers logged in but just sitting there.

It may be something with your Password Manager Settings.




Firefox will remember passwords by default. You may have disabled this feature, or told Firefox to never remember passwords for a particular site.

Click the menu button on the top right, it is to the right of the Home Icon, choose Options.

Select the Security panel.
If it isn't already check marked, check Remember passwords for sites.
To the right of Remember passwords for sites, click the Exceptions… button .
Make sure that the site you're trying to log in to isn't in the list.
If it is, select the entry and click Remove.
Click Close.
Click OK to close the Options window .

Now that you've configured Firefox to remember passwords, try logging in to the site again.

Hmmm, first off I'm already logged in here at GMForum.com, second I only have one exception, an old Verizon site. Anyhow I'm a bit sorry I brought up this off-track subject.