Driving around today, I heard my back wheel making some noise, so the next place I stopped I got out to check it out. Turns out there was a stick wedged under there dragging, but lo and behold while I had my head under there I just happened to notice that my coolant was spraying out like no tommorow. There's a pressurized coolant reservoir which I just replaced, and the cap on it had blown off, and all of its interesting springs and gaskets had come loose. I couldn't let it sit where it was, so I re-assembled the cap, filled up the reservoir with water and screwed the cap back on to drive two miles to my office parking lot, where I could let it sit for a day or two. On the way there I noticed that there was no heat inside the car from the heater. The temperature gauge never budged, either before or after this happened. I flushed the cooling system when I replaced the cooling tank about a month ago. I definitely need a new reservoir tank cap and my first inclination is to check the thermostat. Seems like something must be plugged up to have built up enough pressure to blow that cap off. Anyone have any thoughts?