I have searched the forums for the past few days, and google as well, only thing kind of close is this thread but it isn't quite the same: https://www.tahoeyukonforum.com/threads/electric-radiator-fans-running-more-than-usual.84960/ I have a 2011 Tahoe 5.3 LT 2wd with towing package. Now that it is hot here in Phoenix, when I turn on the car and the AC is on (AC and recirc), the left fan runs at really high speed while the right fan doesn't. The battery gauge reads just past 14 V. When I am driving, the right fan kicks on, I see the battery gauge drop down a bit, below 14 more like 13 or so. I pulled over and checked and the right fan was on, when it turned off the battery gauge went back to normal. I did not have a multi meter with me at the time. A, is this normal? B, is it a fan motor issue or an ECU issue? C, not sure if it is related or not, but the AC does get hotter (up to 48 degrees) and humid for less than a minute (I timed it) occasionally and then goes back to blowing 38 degree air (measured with digital thermometer). These measurements were on a 104F degree day. Yesterday at 109F driving home for 40 minutes, it did this cycle only 3 times. Thanks for any help!