Alfa 166 3.0 v6 super suspected head gasket
Hello, I hope someone can help. My alfa starts to overheat after driving for about 20 minutes. It will reach the 90 C midpoint and stay there for 10-15 minutes, then start to climb. When stationery, the temp needle starts to fall back to the mid point, but then rises again slowly after moving anything over 2000 rpm. I am told the thermostat and water pump are working fine and there is no water leak in the system. The oil is also fine with no milky colouration around the cap. Does this definitely point to the head gasket or perhaps something else? Many thanks for your help.