It sounds like you may need to look at checking the battery. The fan kicking on is telling me the unit is trying to charge the battery and possibly it’s warming up from the charge causing the fan to run. I’m not familiar with the unit whether or not the fan runs all the time or only when it gets so warm and calls for more cooling but that’s where I would start looking if it were me.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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