Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
Thermostat
The thermostat has four basic functions to perform.
It permits rapid warm-up of the motor to operating temperature.
It permits rapid warm-up of the motor to operating temperature
It controls the temperature of the coolant within working limits.
It prevents fluctuation of pressure in the radiator by controlling the flow of water to the radiator and this prevents constant lifting of the pressure cap with the resultant coolant loss
It prevents localised steam pockets within the head and block by maintaining an even flow of coolant to the radiator. Under normal operating conditions, the thermostat is hardly ever open or shut but constantly moves (or flutters) and the temperature variations in the block can be as much as 20 degrees F in spite of this control. It is recommended that thermostats be checked every twelve months and a thermometer be used to ensure it opens with five degrees F of the stated opening temperature. A thermostat should never be removed permanently from an engine as coolant loss and severe steam pocketing will result.
