Google replacement mirror glass for Ford Edge 08.
They make a replacement mirror glass available that uses double sticky tape. This has worked great for me. The heated function still continued to work!! In my case I replaced a scratched mirror leaving the old mirror in place. If yours is broken included is a link for a procedure to replace a broken mirror.
Confirm the dimensions before purchasing. Some car manufactures have more than one design for different model cars same year..
This is an easy repair.
How to Repair and Replace Broken Side Mirror Glass DIY
The cabin air filter is located behind the glove box. Open it then empty all contents. Grab both sides inside the box and push them inward. The glove box will then drop out further. On the left side is a catch cable. Slide that down and pull it out. The box should then just pull out. The cover for the filter is rectangular and gray or black color. On the left side push the tab toward the passenger door and pull toward you. You will either find nothing or a screen. Discard the screen and insert the new filter.
2011 Ford Edge cabin air filter removal and replacement
Do you have one or two keys? If both don't work, it is most likely the receiver in the column, around the ignition. These don't have to be reprogrammed. The system needs to be scanned.
Sounds like you have a pinhole leak in a hose which is spraying coolent on a hot engine part that evaporates it on contact making it hard to track down.
IF YOU HAVE CLEAN WATER COMING UNDER THE GLOVE BOX PASSENGER'S SIDE I BELIEVE THAT THE RUBBER HOSE CONNECTED TO THE DRAINER GETTING OUT OF THE CAR FROM THE FIRE WALL IS OFF. CHECK AND REFIT IT.