Possible malfunctions of the cooling system, their causes and methods of elimination (Chevrolet Cruze J300)

Cause of malfunction	Method of elimination
The engine gets very hot
Low coolant level in the expansion tank	Top up the coolant
Thermostat is faulty (the valve is stuck in the closed position)	Replace Thermostat
The water pump is faulty	Check the pump and replace if faulty
The radiator core is clogged with dirt and insects	Wash the outside of the radiator core
Radiator pipes, hoses and engine cooling jacket are clogged with scale and silt deposits	Flush the cooling system and fill with fresh coolant
The electric fan does not turn on due to breakage of electrical circuits of sensors, failure of sensors, relays or a fan motor	Check and restore electrical circuits. If necessary, replace sensors, relays or electric fan in assembly
Damage to the valve in the filler cap necks (constantly open, due to which the system is under atmospheric pressure)	Replace the filler cap
The engine is overheating, cold air is coming from the heater
Excessive decrease in coolant level fluid due to leakage or damage to the head gasket cylinders, causing the formation of vapor locks in the water jacket engine	Fix the coolant leak. Replace a damaged cylinder head gasket
The engine takes a long time to warm up to operating temperature, the thermal regime during movement is unstable
Thermostat is faulty (the valve is stuck in the open position)	Replace Thermostat
Constant decrease in coolant level in the expansion tank
Radiator leaking	Replace the radiator
The expansion tank is leaking	Replace the expansion tank
Coolant leaks through leaky connections of pipes and hoses	Tighten the hose clamps
The water pump seal is damaged	Replace the water pump
The sealing ring of the water pump housing is damaged	Replace the sealing ring
The mounting bolts are not tightened enough cylinder heads (during long periods of cold parking the engine has a coolant leak at the cylinder head joint with the cylinder block, in addition, traces may appear coolant in engine oil)	Tighten the cylinder head mounting bolts cylinders with the required torque (see "Replacing the cylinder head gasket"). Replace the damaged gasket, restore tightness of plugs
The heater radiator is leaking	Replace the heater radiator

The article was checked: Vladimir Romannikov

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Cruze 1: Cooling system

Features of the design of the engine cooling system

Checking the cooling system hoses and connections
Replacing the coolant
Removal and installation the electric fan of the radiator of the cooling system
Replacing the cooling system radiator
Replacing the water pump

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