Re: Thermostat Opinions

Posted by Bob on December 10, 2006 at 19:42:49 from (69.178.229.154):

In Reply to: Thermostat Opinions posted by Aaron Ford on December 10, 2006 at 18:06:48:

Boy, that's an old thermostat! (It's a bellows type, instead of a newer-style "wax pellet" type.)

1.) Thermostats open slowly as they approach their temperature calibration point. They "modulate" to hold engine temperature constant.

2.) When installed in an actual engine, the operating point of the thermostat is affected by the pressure in the cooling system, and the pressure created against the thermostat by the force of the waterpump trying to move the coolant. So, it will act differently IN USE than it does in an open pan of water.

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