overheating
someone please save me. i have a 1999 328ia that overheats. first my top hose neck broke so i changed the hose and neck and bled system. ran the car for 20 min it was fine. gave it to the customer 45 min later the car overheated on the highway. Then we changed the thermostate and bled the system once again. ran the car for about 45 min. everything seemed fine. gave it to the customer. then again it overheated on the highway. Then we changed the water pump although it seemed to be good , bled the system again. This time we drove the car for aprox 1hour -2hours everything seemed fine. the customer ran the car in the area for about an hour before going home. he just called to tell me as soon as he got home the car just overheated.please help
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