Hello, i have a 2014 GTD , its happening twice now that car is overheating while driving uphills in mountains with bit more load in car , 3persons or more , but never when driving alone . The guage goes a bit over 90 and then fan kick on and goes back to normal but if i keep accelerating it will go higher . In normal driving the temp stays between 92-103C measured with obeleven, and when the gauge moved it was 109 , with oil temp also at 126C . Can it be waterpump bc when replaced a year ago it was not genuine ? Thermostat or head gasket ? Any experiences? Thank you