Hey everybody today is the first day its been fairly cold and I'm not getting heat out of my vents. The car is running steady at 190F and doesn't seem to be attempting to climb over that. Lower radiator hose is hot, Upper is cool so one would think thermostat, but the upper heater core hose is hot and the lower is cold. I've never seen a stuck closed thermostat where the car wasn't overheating. I suppose it could be stuck open but I would think it would be running cold. I'm going to go do a scan and see if there are any codes. Lastly, after I got home I slowly vented the radiator cap, the pressure back filled into the reserve tank and quickly filled it almost nearly full then bled back down on its own pretty quickly too.