Orange. Make sure to bleed out the air if you are filling the radiator.
dex-cool is what is used from the factory but I suggest you flush it out and install regular green antifreeze as the dex-cool has been know to eat head and intake gaskets.
The remote wire on the factory radio in a 2005 F150 Ford Supercrew is usually blue. The remote wire is used to connect extra things to a radio that are not already factory installed.
it is the blue with a white stipe
If it is a RDS system, then you will need to connect the blue wire to the remote wire on the amplifier.
it should be the blue and white wire
Diane Darcy's car is powder blue with yellow and white stripes and a fancy dark blue number 7 on it.
If you are unsure of the remote wire, locate your radio fuse and get a fuse connector. hook it into the fuse and run it wherever you need it. all the remote does is swith the equipment on and off.