c70 2002 flashing light and running hot

[royalone97]

yesterday while on my way to work my transmission mode light started flashing. I understand that is a automatic gearbox problem and followed the procedures of shifting from park to low gear several times to clean the contacts as a temporary fix. The light did not go out, and while driving it home it started running hot. I made it home after several stops to let it cool, and I noticed I had no anti-freeze in the reserve and I refilled it and let the car run all of the anti-freeze ran out and there was none on the ground. Please help.