Cooling system malfunctions

Overheat

• Insufficient amount of coolant in the system (Chapter 1).
• Thermostat failure (Chapter 3).
• Clogged radiator or grille (Chapter 3).
• Malfunction of the electric radiator cooling fan or coolant temperature sensor (Chapter 3).
• Malfunction of the engine management system (Chapters 1, 4, 5, 6).
• Reservoir cap failure (Chapter 3).
• Worn or slipped accessory drive belt (Chapter 1).
• Incorrect ignition timing (Chapters 5, 6).
• Malfunction of the gauge of the index of temperature of a cooling liquid (Chapter 3).
• Air lock in the cooling system (Chapter 1).

Hypothermia

• Thermostat failure (Chapter 3).
• Malfunction of the gauge of the index of temperature of a cooling liquid (Chapter 3).

External coolant leak

• Damaged hoses or clamps (Chapter 1).
• Leakage through radiator or heater heat exchanger (Chapter 3).
• Radiator cap failure (Chapter 3).
• Leakage through the inner seal of the water pump (Chapter 3).
• Boiling off liquid due to overheating (Chapter 3).
• Leak through radiator cap (Chapter 2B).

Internal coolant leak

• Leakage through the cylinder head gasket (Chapter 2A).
• Crack in the cylinder head or in the cylinder (Chapter 2B).

Corrosion

• Infrequent fluid changes and flushing of the cooling system (Chapter 1).
• Out of specification coolant ratio or wrong type of antifreeze (Chapter 1).