Hu, just picked up a new 2011 Hyundai Sonata SE from Dealership. I got it Monday evening so, it was dark out. I driving it home, I noticed that the Low Beam Headlights shined about height of the hood or just a little hight. There is a distnct line where there is light and no light at all. On country back winding roads, can see going down into a turn. very dangerous. Any thoughts on why this is happening.

read the service manual like we do and we pay $20/mo

https://eautorepair.net/Marketing/Default.asp

or google and get lies,
would your risk and engine, on lies, really?
the internet is 1/2 lies, pick one or RTM real.
your call your choice and luck.

For the radio?

The dealership will supply it free of charge if you take the registration document.

Repair your vehicle right away. Just click on the link I attach-

2011 2014 Hyundai Sonata Factory Service Manual PDF

take it to a dealership this car has a recall to check the engine for noise and replacement is does not pass the process tests it is campaign 132 per Hyundai if it has been performed and passed Hyundai will still check engine issues and make possible goodwill repairs BUT this is speculation until know problem with engine/car has been diagnosed

One year or 20000 km.Fan is working.

this being a new car probably with very low mileage the noise you hear is more than likely the exhaust cooling off after getting hot from driving.it will stop doing this after a while when it gets driven more.some cars do this as it gets broke in from driving.

Your vehicle is still under the powertrain warranty. If there's a problem, have it properly diagnosed and, if necessary, repaired under warranty. There's a simple diagnostic check which can be peformed by an authorized Hyundai Service Department. It's a scan of the fuel trims (fuel adaptive strategies) to determine if the engine is running 'RICH' or 'LEAN' Call the nearest Hyundai Dealership Service Department and take the vehicle in for a check (under warranty).

it does depend on the type of driving you do, and break-in is a factor for a new car-mileage will be lower until the car is fully broken in (3-5000 miles), and if you do more highway driving than stop-and-go it will affect your gas mileage.

I just bought a 2011 Sonata and am experiencing the same problem. Going downhill with cruise set at 55 mph; speed increased to 70 mph and was still accelerating (from the downhilll grade) when I finally pressed on the brake.
This is not normal. My Honda Accord never varied from the cruise setting by more than 3 or 4 mph ... going uphill or downhill.

My airbag light stays on too. It could be a code you could just clear. The Sonata has several airbags. It could be a non working seat airbag, or even a thrown off senser (which is common in this car)! I dont think its worth 80 dollars to fix at the dealership. Go to auto parts store and get it checked.