I've read this Forum and another one dealing with this same exact problem and I have an 04 Tahoe LT with a dual digital AC Control Module that has been doing this same thing for years. Just this week though it decided to stink in the heat mode on the driver's side and I took it in to a friend that read the computer and found no issues. He popped the fuse under the hood and reset it but that didn't work either. He suggested purchasing an AC Control Module but I'm hoping that SOMEONE has since this thread was last posted in has resolved the issue. I'd really like to purchase the CORRECT part to fix it instead of buying a Control Module and if that doesn't work, then buying an Actuator. Has ANYONE gotten their vehicle fixed permanently? And if so, would you please reply and note what part needed to be replaced. Thanks!