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Check the coolant level.
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Check for the coolant leakage (from gaskets, hoses, O-rings, etc.).
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Check for dirt, leaves, or insects on radiator and condenser.
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Check for deteriorated coolant.
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Check for damaged or deformed fan shroud.
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Check for plugged or deteriorated radiator hoses.
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Check for plugged heater core of hoses.
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Check for a damaged cylinder head gasket.