Are you talking from experience with this specific model of car? Because newer TDI’s (and probably anything else with a charge cooler) really do need to be bled using /. The low-(charge cooler, , engine block) and high (cylinder head, turbo’s, ’s, etc) temperature coolant circuits share the same fluid reservoir, but are only directly linked during very specific engine conditions. Running the bleed procedure opens up all valves (and probably engages all 2/3 fluid pumps at 100%) to let the air out. Waiting until this happens by chance will have you running a partially empty cooling system, and these circuits definitely do not link during engine warm-up.
@TS, with my car the engine needs to be running and the brake pressed down and held during the procedure. I dont remember if you also need to push the htrottle but provided all directions. If you release anything you need to hold down the procedure immediately aborts.