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Kat, the air bleed hole on Wattman's thermostat is tiny. I should have tried to measure it by using a very small drill bit. The thermostat itself is so small that it's hard to enlarge that hole much, not much metal to remove without damaging the 'stat. Even with the slightly larger hole it took a few heat/cool cycles to get air out of the system. I'm not sure the hole makes any real difference with cooling but it is bound to help when bleeding the system. It is important to install the thermostat with the hole 'up'.
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