I've been having a issue with coolant loss on the 1.6tdi 2015 occy ive had it about 2-3 months. The water slowly drops around 200-500 miles i get the check coolant error, i check under the bonnet and its either low or almost 1cm from the bottom (its always checked when cold when possible) So after a few errors i contacted skoda they booked me in for a pressure test he said it could be the water pump he fitted it but stil no joy.. i called again the techs kept saying it might be a air lock e