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This could be from the A/C evaporator drain if it's occurring when using the A/C, a water leak if it happens after it rains or a leaking heater core (leaks anytime). If the heater core is leaking you'll smell a "sweet" smell inside the car and the windows may fog up.
Disconnecting things is not a good way to determine what is wrong, it doesn't give any real clues as to what might be bad. You'll need to see if the compressor is getting power when the A/C is not cooling, if it isn't then the electrical circuit to the compressor needs to be fault traced to find the problem. These systems are fairly complex so I advise taking it to a professional.
It may be from a leak in the brake hydraulic system, or it could be from normal brake wear. As the brakes wear, the fluid level in the reservoir drops slowly and needs to be topped up regularly. If you topped it up and the light is off, and the brakes are operating normally, then drive it and if the light comes back on take it in to have it inspected for a leak. I bet it was normal and there's no problem.
Depends on what is wrong. Could be a bad bulb, wiring or something else. Have a shop look at it to determine the problem, they will probably charge .5 - 1.0 hours to look at it, so about $50-$80.
There are a bunch of things that can cause the A/C to blow hot air, but you'll need some special gauges and equipment to deal with A/C work, not to mention a good understanding of how A/C systems operate. I strongly suggest taking it to a repair shop for this problem.
What codes are being stored in the module when the check engine light comes on?
Then you should get a good repair manual to see what is involved in removing the needed parts, and I would check to see if anyone has posted a video on youtube that explains how to do this.
It's hard to know exactly what it is before performing a few tests on the window circuit, but that button controls some type of relay that feeds power to the 3 window switches, and I suspect that relay or the wiring is the issue. I suspect a shop will charge you an hour of labor to look into this. So about $100 or so.
Almost every car has the thermostat at the spot where the upper radiator hose connects to the engine block. Look there for a metal housing and the thermostat is in that housing.
This could be an oil leak that is leaking onto the exhaust system. Better get it looked at by a shop, this can potentially be dangerous when oil is getting onto hot exhaust, not very often, but possible. http://repairpal.com/chattanooga-auto-repair