Michelle, from the info I have, it looks like the vents are controlled by a vacuum controller. It's possible that the controller has failed, or there is a vacuum leak. Do you hear a hissing noise from the dash area when the engine is running?
Are you blowing fuse #18, 20 amp? My guess without seeing the vehicle is that the heater element in the O2 sensor is where the fault lies. You can try disconnecting the O2 sensor and see if the fuse still blows, this may set the check engine light though. If the fuse doesn't blow, then the O2 sensor will need replacement.
There is a heater element in the O2 sensor that heats up the sensor, this heater element can fail, and cause this fault. Check the fuse, but you will likely need to replace the sensor to remedy the problem.
The power steering system has 3 main parts, the pump, steering rack, and the hoses. Any three of these can and do leak. You will need to identify where the leak is coming from, or take it in to a shop to have it diagnosed
It's very difficult to tell what the cause can be without more of a diagnosis. It's unlikely that you have a bad injector or fuel line. Is the Check Engine Light on? You may have a fuel delivery problem, a bad sensor in the engine control system, or something else. I suggest you have the codes checked first.
Sounds like the battery is overcharging. Overcharging is from a high charging voltage, caused by a bad voltage regulator in the alternator. Do you know the charging voltage while the engine is running?
There's a good chance your coolant fan thermo-switch is failing, causing the fan to stay on. Here is what it looks like - http://www.evwparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=1H0959481B&Category_Code=NewBeetleCooling
The ISC (idle speed control) valve is attached to the throttle body. A diagnosis of your cooling system will need to be performed to properly determine the intermittent cause of the high engine temperature. The thermostat may be sticking, or the cooling fan may be failing. If you take it in to have it checked, try to be able to duplicate the problem for the mechanic. Here are some tips on addressing intermittent problems - http://repairpal.com/blog/Addressing_Intermittent_problems
The power window fuse is # 14 and the wipers are fuse # 2. Sorry, but I don't have a picture, have you checked the owners manual or on or near the fuse box for a diagram?
As a theft deterrent, some ignition keys have a microchip in them that needs to be programmed to your specific vehicle. It is possible you have one of these.