I have had to add coolant to my tank 3 times. I don't have any leaks but I did find some moisture near the thermostat elbow going into the manifold. But no accumulation anywhere. I checked the heater core and my carpet is dry. I don't seem to be burning coolant. No white smoke. I don't think there is any in my oil. Where could it be going. The tank doesn't empty but got about halfway low. For the amount missing it has to be going somewhere. No puddles on the floor. Wtf. Where else can I look.