2002 Ford Focus Overheating problem

For a little while now when I'm stuck in traffic or at a drive threw window the needle to the heat on the dash moves to the red. But I dont see smoke or it asctually overheating so I just always shut the car off and the needle would go back down. Then yesterday I was stuck in traffic and it started doing the same thing except this time I noticed smoke and the car was really overheating this time so I pulled over to check to make sure it had water and it was low so I put water in it then I noticed it was just pouring out the bottom right when I was pouring it in. I'm not too sure what is wrong with it and I wish I had an idea so I can plan money wise. I've had alot of mechanic's screw me over. Fixing things and breaking things at the same time to get you to come back or just not fixing it properly at all. When I brought it to this one mechanic to fix something with the fan years ago he put a truck fan in my car! I dunno why but now whenever the fan kicks in it's SO loud! Another problem I've been having is the heat is not working. It has 4 speeds to put the heat on 1-low 4-highest it will go and nothing comes out when I put it on 1, 2, or3 If I put it on 4 it comes out but it's not hot air. After driving for a very long time I notice it's a little hotter. I just would like to hear any idea's before I have it towed to a mechanic and have them lie to me about whats wrong with it. Thanks!