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What make or model year please?
On Dodge products; Bank one is the drivers side, Bank 2 is the passenger side. These will be the the sensors before the Cat(s) Now if you get a report Bank One , Sensor Two, that refers to the sensor which is AFTER the cat. This reports the efficiency of the Cat to the computer.
A 'blinking' engine light means "Get this Checked out NOW! could be something with the cat converter - which could damage the whole vehicle - like a fire? A steady light means you can deal with it later. That car has to go a shop ASAP - for your saftey!
Your fan is linked to the A/C system. Is the AC on? And it will come on via a computer command if the engine is above a certain temp. I think it's 216 to 219 (degrees) for that vehicle.
Check with the selling dealer. Chevy had a bunch of defective ones go out the door. See if their is a 'Silent/Goodwill" recall for a freebie.
Chevy had a whole serious problem with the soldering on those particular panels. Check with the selling dealer to see if you are eligible for the 'silent/goodwill recall'. Tell them Guido sent ya!
Your battery will have two posts, one negative, one positive look for a + sign on the battery for positive. Also see which post has wires running to the engine block ground. That is your negative post.. always keep them clean and tight, no corrosion showing. Do not let anything metallic fall to connect the two posts - you'll get a bit of fireworks and could even damage the vehicles computer.
Sounds like an intermittent problem, something that takes a lot of time to chase down. Your mechanic will hook up a scanner to see what's going on inside the vehicles computer - it's called 'taking a movie' so the computer will show just what system failed & when. If the budget don't allow for a pro, then start looking for loose connections in wiring. Are you getting any codes from the computer?
Do you knnow how to use a vacuum guage? Start there, I suspect a worn or jumped timing chain. Strange odors? then look to a plugged catalytic converter. Dollar for dollar - even in a modern car, your vacuum guage is the best bang for the buck.
Ahhh ... the Question of the Ages, Why do Auto Engineers do...? Usually they try to go the shortest route between two points. All modern vehicles have approx 14 to 25 different sensors, all of whom have to report back to the vehicle's computer. So they tend to bunch them up so it don't look like a bowl of spaghetti under the hood.