Computer problem
2000 Hyundai Amica 4 cyl Front Wheel Drive Manual 89000 miles

Hi,
I have bought a car without a manual. can you tell me what the yellow light that looks like a submarine, with a lid on the top and the side means please? it has the word check written underneath.
the radiator is full , washer has some liquid in, oil is ok. Is the loose tube coming from the coolant meant to go anywhere or is it a drain?