My buddy has a 2001 vw passat V6 30v its been over heating if u run the car for one min. waters stays full if u run it for 3to 5 mins and shut it off the min the motor shuts off the coolent res gose empty and a little pump or something on the passanger side of the car, is still running we can hear water but no leak just water flowing through the hoses and then u star the car and still empty didnt leave the car ruuning just stared it for a sec to see if the water returned. check the oil to see if the water was flow in the the oil pan but not milky or water in the oil i lost help pls