97 Ford Taurus overheats when stopped, but coolant pours out when turned off

I have a 97 Ford Taurus, it overheats
when I stop but pours out coolant when I
turn it off, the fans are working. I have to
ride with my heater on so it don't overheat
but that doesn't stop coolant from
running all over the ground when I turn it
off, I have to fill the reservoir Everytime I
drive it. Please help! I don't have alot of
money so I need to know kinda what I'm
looking at before I take it to anyone of
these shops due to them wanting to over
charge me just to look at it, I ended up
paying almost 1,200.00 to a guy an a
shop at one time due to just guessing an
fixing what they thought it was an
obviously they was still wrong.. thanks