Hello. I’m just changing the cooling water at my Fiesta and I’m just hitting very ambivalent opinions. In the circuit is quite a lot of mud (rust deposit), although a buddy has already blown me through with a pressure gun from Hazet (wash attachment). So I try to expand the termostat again and drive 3-5 times with clear water with a few km. However, when filling I’m unsure, since the buddy has finished mixed G12 and I stand here with concentrate and dest water. Should there be water in there at all, or does the frost protection have no buffer effect for the slightly acidic pH value of the water, so that I should rather take tap water? We are talking here about the tap water from Bad Kissingen (Low Franconia) which contains a bit more lime. Lg