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I am having an issue with rear air in my Burban. The other day I was running to work and I heard extra heavy fan noise in the rear. I got to work and figured out that the rear floor vents were blowing HOT air with A/C on. The Hot Air was hotter and harder than it has ever been. The front air is on high and cold. The rear air controls in the front have to be turned to rear in order to stop the hot air. I have NO idea what this could be. I had the A/C fixed last summer. Can anyone help with this. It is supposed to be 108 today
 
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