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Check your coolant level. This sounds like very low coolant with enough coolant to partially work, but with large air bubbles in the system.
 

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P0171 is an indication the PCV valve has gone bad. Also, keep an eye on your coolant level. The water pump in the 1.4T Cruze has a 150,000 mile/10 year warranty, but it's possible that the leak is elsewhere which may or may not be under warranty anymore for you.
 
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