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2012 Chevy Cruze. 34k miles Engine temp shows no difference on guage (216 deg.) Coolant level has lowered some. Cooling fan running at high speed even without A/C. Check engine code PO597- Generic thermostat heater control circuit/open.

Vehicle: 2012 Chevy Cruze, 1.8L (non-turbo).

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The thermostat is mostly likely stuck, start by replacing the thermostat

if you are under warranty it should be covered. 

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