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Old 12-31-2008, 01:09 AM   #20 (permalink)
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Originally Posted by Tango Charlie View Post
I think most thermostats have a small hole in them so they still circulate a small amount of coolant when closed. At least the thermostats that I've seen.
No to source to cite (other than myself), but it is an over simplification to think of an automotive thermostat as simply a two state (on/off) device.

If you take a new one and toss it in to a pot of cold water on a stove over low heat, you'll see it slowly open as the water temperature nears the thermostat's nominal operating temperature.
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