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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.
Sounds like this could be a blown head gasket or cracked head. The best test, short of the chemical "Blok Check" is start it up cold. Run just above idel for one or two minutes. Then shut the motor off. Carefully remove cap: If there is pressure, it came from combustion, not the engine heating up. If there is pressure, it could have only come from combustion gasses buidling up. DO NOT DO THIS ON A WARM OR HOT ENGINE - SERIOUS RISK OF INJURY SHOULD YOU DISREGARD THIS!!
Carefully monitor your temp gauge and note any additional water or antifreeze added. Write it on the radiator- next to the filler cap if you have to. You don't even want to think about tearing down a BMW for inspection or repair. If you have that Aluminum Engine, the whole lower block - not just the heads - you'll have a nightmare if one the bolts strip out while being REMOVED. Good luck!