Car is a 2006 2.0TDi140, 44k When i test drove the car 4 weeks ago the coolant was low so i mentioned the possible head problems and the salesman said it would be sorted. When i picked the car up a week later the coolant was above max? and when i asked what had been done he said everything was sorted Now 350 miles later i've just had a look and the coolant was at the min mark so obviously there is still a problem. there is no mayo on the oil filler cap or on the dipstick, no leak on the floor nor anywhere else i can see. Could it be the cracked head problem without showing any of these signs or would i see mayo for definate? Dealer is 90 miles away but i have an AA gold warranty which i was told i can use at the local main dealers?