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Well, I finally have a situation where I need some help. I have a 2015 GMC Sierra Denali HD. Today I noticed that my vents were blowing cold air after the truck had warmed up substantially. The temperature setting was at 75 degrees the air coming out quite a bit cooler as it is 22 degrees outside today. I messed with the temperature the higher I went the cooler and higher the fan went. I set it to high maximum on both sides and finally blew hot air on the passenger side only. I did a little research and found that it could be the actuator door on the driver side. Has anyone else had this problem? I'm sure there is :-). What is the best way about repairing this or confirming that it is the blend door actuator? I can get into this thing I just need to know the steps to do it and I'm sure I can fix it. Any help would be much appreciated. Also, if there is a link to a place on this website or Tapatalk to review that would also be appreciated as I have done a search and could not locate anyting. UPDATE went out this morning start of the truck up everything worked normal. The blending of the vent system seem to work with a thermostat everything seems to be back to normal. And of course this makes me worried LOL when will it happen again? :-)