I noticed a coolant leak that was dripping onto my serpentine belt. I replaced the thermostat housing (Toyota Part 163210F010) as well as the thermostat seal. After around 200 miles my reservoir tank is empty and notice coolant around the thermostat housing and eventually on the serpentine belt. I tightened hose clamps and nuts. Is this a thermostat/ housing issue? I have been using Prestone Green coolant.