dont use expansion bottle level as indicator of coolant in engine remove both bungs and fill too over flowing a excess will blow out cap ,ive seen so many level in tank but air in hoses and head
this may be a daft question but i havent looked yet as iv been workin on the gearbox change issue but witch bungs are these and where should they be on a 300 tdi?
iv had many a vehicle thats changed from original so i like to know how it shud be unless the mod is better of course lol