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Just throwing this out there, the Cruze (and most modern cars) do not stop coolant flow to the heater core when the heat selector dial is set to cold. There is always hot coolant flowing through the heater core, even in the summer with the AC running.

There is a blend door in the HVAC module that controls how much air from the fan goes through the heater core. When set to full cold the blend door keeps all air from flowing through the heater core, and when set to full hot all air goes through it.

If a thermostat is stuck open it will keep the car from warming up, but it must be understood that these tiny engines do not produce a lot of waste heat, and using the heater definitely increases the time it takes to get the engine up to temp.
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