i have a 2002 chevy malibu and it heats up quickly it almost hits the red mark even when its cold out side. i drove to Los Angeles about 30 min from were i live and when i parked the car the green liquid had all drain out thats the only time the water drained out what could be the problem. can it be the cooling system and if so should i flush and if thats the problem how can i do it myself?????????????