Chosen Solution

I poured coffee on my Macbook Air. :( I went to the service center. They said that logic board died so you buy it to reuse your macbook air. But it is so expensive about 900$ Are there another solution about this? Please help me!

Try the ifixit water damage guide–you might get lucky. Link provided. Electronics Water Damage Teardown link MacBook Air 13" Mid 2011 Repair

is over flowed?

You could buy one off ebay depending on model you need for 50 percent or more discounted price. Then install yourself.