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Old 04-21-2005, 09:58 AM
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Thermotats are sitting in engine coolant yes, but the water behind the 'stat is stagnent, or without movement. Without moving coolant to carry heat to the 'stat copper thermal device, you have to wait untill the heat moves through the water to reach the 'stat. Convection. This can take awhile. Heat moves through water at roughly 1/2 per minute, depending on the density and impurity's tempeture ect..., You see, it has to move through the heads, throught intake jackets, some will go through the metal of the intake but most will go through water for it's less restrictive for convection. If you measure the distance you get several inches. All the while the water near the sender keeps rising.
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