CTS V6-3.2L VIN N (2003)
The HVAC control module will command the afterboil/heater coolant pump on when the engine is off under the following conditions:
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The engine is OFF.
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The engine coolant temperature is above 101°C (214°F)
The above coolant flow circuits are designed to show the coolant flow related to the coolant by-pass valve positions only. The thermostat function and
thermostat coolant flow paths are not shown.