How to fix no HEAT from the central vent on BMW E36

One day I've found there was no heat air from the central vent,

so I spent some time checking it out.

滑鼠右鍵Adobe Acrobat等指令消失但可運作 (The Adobe Acrobat entry in Context Menu is missing but still works)

Windows 7 x64環境，
原先已安裝Adobe Acrobat X Pro，
再安裝Backup and Sync from Google後，
按滑鼠右鍵選單，
Convert to Adobe PDF等指令變成空白。

How to connect SONY PS3 controller to Mac (High Sierra) with Bluetooth

The information I've found on the Internet are mostly wrong. The steps below are tested and worked.