Hi guys


So I have had my 2013 1.6TDI audi a3 for the last 4-5 years, it's been bomb proof but ,recently it's not been kicking out any heat. It decided to warn me that the coolant was low (200 miles into a 300 mile journey), I let it cool for an hour, checked it and it was indeed very low (only just in the reservoir), I topped it up to the max line and when I checked it the next day, it was well over the max line. I drove it all the way home with no Coolant issues (still no heat) but the coolant is still way above the max. I think there is an air lock somewhere (if you guys think otherwise then please shout at me) but I can't find a bleed valve anywhere. Anyone got any thoughts? Cheers.