Smoking Vents?

[Rosco]

Now there's a little more to the story then thought. I cleaned out my whole cooling system, but i never got the chance to replace the thermostat. After I cleaned it out, everything seemed to be going fine. But now, the color of the coolant in the radiator is brown, i can visually see foam on the water when the cap is off. I plan on cleaning out the radiator in a couple days with cleaning solution so it's absolutely clean inside. Other then that the temp on the guage seems to stay constant, which is making me think that I need to possibly fix the sending unit? I'm not sure what it uses to detect the coolant temp. Also the other problem is, it does seem like i have a leak somewhere, I have to fill my radiator every couple of days, so I know this isn't going to be fun. I am also just thinking about throwing on another water pump when I clean out my system fully next time. My other question, is there any easy way to get the thermostat housing off? I noticed that the lower driver side bolt looks like it will not be able to be removed with the water pump still attached. Unless I am just seeing things that is. But I also have not gotten any bubbling since i cleaned out the system.