At the risk of sounding stupid, doesn't the thermostat have a little jiggle valve that when installed almost? up allows the system to bleed air
I just copied this fr the FAQ's
Thermostats must be installed with the small venting nipple oriented upward. If incorrectly installed,Thermostat and O-Ring an air pocket will form in the thermostat housing causing a reduction of cooling abilities. When you replace coolant, loosen the thermostat housing when refilling and bleed air from the system until the coolant appears at the thermostat, just to make sure you have no air bubbles.
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