By any chance while you were having this under cooling problem was your heater not working either? I am currently having this problem but from the normal Temp its about 1/8 under normal and the heater doesn't work new water pump new Thermostat/ Sensor and the reservoir Cap When the car is sitting still the Temp Is normal Tested for Head Gasket Leak everything good so its not the head no smoke or anything everything has warranty what do you guys recommend I do ? or check or try I did pump the Housing House with cap off for air bubbles