2001 mercury cougar v6 2.5liter

I recently got a tune up and flushed my coolant/anti freeze. A week later my coolant light came back on the dashboard. Yesterday i drove about 13 miles and when i got home my car was smoking and i believe the coolant was leaking but not from the top maybe a hoes. Then today the car started over heating within 2 minutes of driving even after pouring water in the coolant. It stayed at medium heat when i drove 30 mph or less and didnt accelerate too quick. Do you know how i could fix this? And it is also making like a squeaking noise