The other day I was driving my 2012 SHO, it was warmed up and heat coming out the vents and suddenly it just started blowing cold air, just like if someone just flipped the setting and turned the AC on (it literally changed in something like 10-20 seconds). It was in the teens outside, it's been cold. Both sides are the same temp, once the engine warms up it's not as cold as outside, but I'm guessing its like 30-40*. Settings don't matter (auto/manual, any set of vents, same or different temps on each side...) I did some googling and didn't really see anything that matched exactly, a lot of "passenger side cold" and "goes cold at idle or light cruise" (seems to be low coolant). I checked the coolant (it's fine, looks good, tests good). The passenger side cold stuff seems to be the actuator but a lot of people report that disconnecting the battery seems to fix it. Well it doesn't match but it won't hurt to try. I disconnect the battery, let it sit for 15min and reconnect. I take it for a test drive and everything appears to be working once the engine heats up. I drove it to the gym, to a friend's house, it works fine. I leave to go home. No heat again. Any clue what is going on?