Cooling system

24. Overheating

• 1. Insufficient coolant level in the system (Chapter 1).
• 2. Malfunction of the coolant pump (chapter 3).
• 3. Clogged radiator or clogged grille (chapter 3).
• 4. Thermostat failure (chapter 3).
• 5. Broken or cracked electric cooling fan impeller (chapter 3).
• 6. Violation of the tightness of the radiator cap (chapter 3).
• 7. Malfunction in the engine management system (chapter 6).

25. Hypothermia

• 1. Thermostat failure (chapter 3).
• 2. Inaccurate temperature sensor readings (chapter 3).

26. External coolant leak

• 1. Deterioration/damage of hoses; loosening clamps (chapter 1 and 3).
• 2. Malfunction of the coolant pump (chapter 3).
• 3. Coolant leak from radiator or expansion tank (chapter 3).
• 4. Leakage through the engine drain plug or through the cylinder block water jacket rod plugs (chapter 2).

27. Internal coolant leak

• 1. Leakage through the cylinder head gasket (chapter 2).
• 2. Cracks in the cylinder head or block (chapter 2).

28. Lack of coolant

• 1. Too little coolant in the system (Chapter 1)
• 2. Boiling off the coolant due to overheating (chapter 3).
• 3. Internal or external leakage (chapter 3).
• 4. Malfunction of the radiator cap (chapter 3).

29. Poor coolant circulation

• 1. Malfunction of the coolant pump (chapter 3).
• 2. Reducing the throughput of the cooling system (chapter 1 and 3).
• 3. Malfunction / misadjustment of the coolant pump drive belt (chapter 3).
• 4. Stuck thermostat (chapter 3).