Keep in mind that heat complaints are regional.we live in an area where the cold can overwhelm this cars heating system and that is because this little engine is almost too efficient. With the above in mind, a thermostat that is open at lower temperatures negates all the engineering work that I stated above.wear, mileage, emissions all will be negatively affected.heh, along with lousy heat. Oh, yeah.the heater works better too, heh heh. This allows the fuel mixture to be leaned further based on information from the coolant temperature sensor. The higher temperatures contribute to complete combustion, lower emissions, lighter load on emission controls (specifically the catalyst, since it isn't burning as much unburned fuel from incomplete combustion). operating temperatures above 200 degrees reduces piston ring wear.this equates to a friction reduction and a mileage gain. The high pressure reduces the possibility of steam cavitation in the cylinder head water passages surrounding the exhaust valves and tends to keep temperature the same throughout the cooling system. So, the factory setup of coolant/water and 20psi cap allows for, approximately, a 50 degree cushion before boilover. The boiling point of a 50/50 mix of coolant/water under pressure, (in this case, 20psi.the coolant cap on the Cruze) is 275 degrees f. Keep in mind, a correct mix of coolant to water ratio raises the boil point to 223 degrees f at atmospheric pressure. There are several reasons with the primary being fuel economy and emission control. hy the need for the higher opening temperature for the factory thermostat Click to expand.I had a discussion with about why the Gen I Cruze runs such a high temp and this is what he had to say:
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