Thanks all.well test drive car 15min run all seemed good This was a saturday morning they said casr had to go through workshop ok then pick up tuesday morning.
Anyway pick up car head towards wollongong just past national park turn off and temp bang straight to the red then banging and thumping coming from floor and front of car i pulled over fast i could.rang dealer went ballistic wanted my old car back they said oh cant the manager isnt here(bullshit) tow truck flatbed picks up its in work shop they cant find anything wrong with it???? no leaks or anything so young fella apprantley worked for a porsche place but has ended up in mercedes? anyway they think it was an air lock,in the meantime i was ringing them and saying hey it could be coolant box check under carpet for leakage its all good they had it for 1 1/2 days looking guessing but all the time the light is flashing next to temp gauge and that means coolant level but no dealer tells me it goes of when engine reaches the correct temp??.I pick car up tuesday drive home with light flashing but temps stayed at 85-90c didnt overheat this time once cooled i checked coolant box and kick a dead cow i had to add nearly 2liters of coolant no more flashing light.Atleast i have 3months warrenty if breaks down so iam going to drive the pants of it for 1 week and see how it turns out really not happy with that workshop they dont seem to be up to date on things.