Hello could Use Some help if able I have a 2000 Audi A6 2.7 Turbo Quarto I Have Not Driven My Car That much because I Had Been out of the country. But I come back drive a little and Now the coolant light came on and car started to over heat i put coolant into the car but it wont full up it was about a gallon i put in after that i didn't put anymore still saying its over heating anybody would know the problem possibly

 

Did the coolant you put in leak out on to the floor? try putting a box under the car so you can see where the coolant is going. There could be a hose that is leaking.