Fans turn on randomly causing my battery to drain

Hello, I understand it would be frustrating for this to happen. Unfortunately there's no easy answer I can provide in this form. You'll need to have some hands-on testing to find out what's happening. Why are the cooling fans being commanded to be on after you've left the vehicle? Diagnostic test equipment should be connected to check the operation of the related components and sensors. There's a fan control module that may be causing the problem but may also just be feeding off of information that is provided. So no rush to judgment here. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops