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Take the radiator cap off and check the coolant level. Don't use the overflow bottle level, it isn't usually accurate. If it is full of coolant then find where the heater core hoses run into the car, just under the intake manifold there are two rubber hoses next to each other, and see if they get hot when the engine is warm. Report back with your findings and I can assist you more.
It is much more likely you are low on coolant or you have an air bubble trapped in the cooling system. You should bleed the cooling system to get any trapped air out and make sure it is full of coolant.
Remove the serpentine belt and run the engine to see if the whine still exists. If the whine is gone, try moving the pullies by hand to feel what pully is rough or has a lot of play. Your issue with the heat is likely separate from the whine. You have air in the cooling system. With the engine cold, remove the radiator cap. Fill the radiator to the top and run the engine until it gets to operating temp. The level in the radiator will drop, this is when you add more coolant and replace the cap. Make sure your overflow/resivoir bottle is half full with coolant.
This CODE is Indicating that ENGINE COOLANT TEMP is NOT Reaching TEMP HOT Enough to >CLOSE LOOP < This is when ECM takes over ALL ELECTRONIC CONTROLS, . It Basicly Points at A Coolant Temp Sensor that is Faulty or Thermostat that is RATED too LOW. Engine Must Reach 200 - 220 degrees
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