Engine Cooling problem
1997 Audi Quattro 6 cyl All Wheel Drive Automatic

I JUST GOT THE CAR I DROVE FOR 1/2 HOUR AND IT OVER HEATED NOW THEY DO NOT KNOW WHAT THE PROMBLEM IS THE FANS WORKS WHEN YOU TURN THE AC ON BUT THEY DON;T COME ON TO COOL THE CAR OFF BUT THEY SAY ITS NOT THE THERMSTAT HE PUT A NEW WATER PUMP ON AND ITS STILL NOT THE WATER IS COMING FROM THE TOP OUT OF THE PLASTIC CONTAINER THEY SAY THEY CHECK EVERYTHING AND THEY STILL DON;T KNOW WHAT;S WRONG DID I BUY A LEMON OFF THIS PERSON ON THE STREET .