LOL Dan. Smart ass.
Scruffboy- I've swapped my thermostat 4 times in the 2 years i've owned my car and I never had a problem bleeding my coolant. I wouldn't drill a hole in my thermostat. I would use a 180 degree.
If air is getting into the system and you can not see any coolant leaking on the ground (leaking gasket or hose) or into the cabin (from a leaking heater core) then its coming from a leaking head gasket, and if thats the case, then the air in the system is laced with CO (carbon monoxide) which is what a block test kit is used for, detecting CO in the cooling system. I HIGHLY recommend performing a block test while you swap thermostats, the test kit is only $50 from NAPA, best $50 I've ever spent diagnosing my supra.
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