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Where to drill air bleed hole in Flowkooler thermostat?

I normally drill an air bleed hole in regular thermostats.  It makes filling with coolant easier.  There is plenty of flat area on a regular thermostat for a small hole.  I am not sure where to drill a Flowkooler.  Maybe the side?

robertshaw_333_series_thermostats_351c_400m_351_grande.jpg

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Last edited by George P
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