Hello Volvo community! Now it might have caught my V70 II D5, 163 HP (376ts KM): The car loses strongly on (short) AB drive coolant. Does it have to be the head seal or even a hair crack in/at the block? The car does not smoke white and does not have any mud deposits when I open the engine oil cover. There are also no puddles or the like under the car to recognize. Are there also other causes/damages than the described above? So Kopfd I have read about a CO test in the cooling liquid tank. Are there other ways to verify this? And if one of the two cases really happened, what would be useful to change/change everything next to ZR & WaPu? Thank you! LG, Max