It doesn't say what happens if your aluminum radiator never lets the engine
get over 180 degrees.
> stays closed during engine warm-up, preventing coolant from leaving the engine
> and circulating through the radiator until the correct running temperature is
> achieved. Once the temperature of the coolant rises to between 180 and 195 F
> (82-91 C), the car thermostat starts to open, allowing fluid to go through the
> radiator to be cooled. And by the time the coolant reaches 200 to 218 F
> (93-103 C), the auto thermostat is open all the way.
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