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You have a coolant leak. Just because a leak didn't exist at the last service interval doesn't mean one hasn't appeared since then. Cruze coolant leaks are frequently very difficult to find so not finding any signs of a leak doesn't mean there isn't one.
 

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If they can't find one ask them to put a bottle of coolant dye into the tank. This dye will leave a residue that's visible under both regular and UV light. I had to do this to track down a faulty o-ring in my coolant tank cap.
 
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