Hello, I have a Chevrolet Berette with 3135 cc engine and 110 Kw automatic transmission.Since recently I have the following problem with the car:When it is cold I start it and start driving after a short time the temperature goes up to the red area,after that it sinks again slowly and goes into the normal area there it remains then also, the car consumes water at 100 km approx. the half water tank, I have looked after the oil there is no water in it I also got in the car chaut under the floor mats and so there everything is dry running out does also nothing have it always stand in the garage.At the head gasket also nothing is oiled completely dry as it should be.I drive with the problem now already over 500 km it always runs perfectly I just always have to tip water after the oil I also regularly see if there is water in there but there is no water in the oil.What can that be ????