K value of thermostat K value of thermostat Greg5OH (Automotive) (OP) 16 Oct 13 09:19 Hello, any idea what the flow restriction value is through an open typical automotive thermostat? Thanks in advance. RE: K value of thermostat GregLocock (Automotive) 16 Oct 13 17:08 Well short of actually looking at one, about 300 mm^2 sharp edged orifice, or a bit less. Cheers Greg Locock New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?