A fan, which I am currently testing has a connector for connection to the connector for the fan on the Board VIM2. I got this fan from Khadas, along with VIM2. According to preliminary tests, this fan is noticeably quieter than the VIM1 in the work and has the ability to control (in Android - preset 4 option). But this blower has a caveat - very small connector to connect. It is very difficult to connect, need miniature hands, tweezers and a magnifying glass. I also tested other fans without a special connector (I have them connected the same as VIM1 contacts 3.3 V 40 pin connector).
I would recommend Khadas, from the factory to install the fan and radiator on the model Pro and MAX. And have to be installed on all models VIM2 firmware DualOS. This will solve a lot of questions from users. Many people buy VIM2 due to the presence of the ability to use Linux. The stock factory universal firmware, will allow without the need for an independent perebroski, to assess what kind of system he needs more. If you want, anyone can go on the net with DualOS Android or Ubuntu. In the coming days I will try to publish an additional report and photos.