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Posted by Daryl in Oz [58.179.160.90] on Tuesday, November 20, 2012 at 16:00:51 :
In Reply to: I did it to test it out... posted by CSCameron [68.228.198.56] on Tuesday, November 20, 2012 at 15:12:45 :
A lot of thermostats are made with a little bleed hole already, I've always associated it as a bleed hole to allow any trapped air to bleed away and also as a safety in case the t/stat failed. A small hole like that will only have a very minor, almost negligible effect on the water flow. Think you are seeing the effects of the outside temperature.