Update: I think the head broke, there was just a small hiss when I started opening the cap while car was still hot, but something told me to smell the insides of the bottle-kinda gasoline-ish smell but it could just be an old coolant
Update 2: I added 1.5l of water and car drank it all. I continued to fill it up all the way to the cap so I can observe any bubbles or foam. After starting the car and letting it warm up on idle,there was not a single bubble. I observed when it will turn on the fan and it looks like the gauge is not faulty-it turns on at around 85-87c as it is supposed to do. But now after adding water,it won't go past that temperature,also I started reving it a bit and there were still no bubbles, but as the thermostat opened and water started to expand from the heat,water started seeping out. Car runs fine now with normal temperature but still, it doesn't delete the fact that 1.5l of water was missing-and that the car was running at 110c for quiet some time today.
Last edited by Dorian; 03/08/2019 18:26.