Cause of malfunction | Remedy |
The engine gets very hot | |
Low coolant level expansion tank | Add coolant |
Faulty thermostat (valve stuck in closed position) | Replace thermostat |
Faulty water pump | Check pump and replace if defective |
Radiator core clogged with dirt and insects | Wash the outside of the radiator core |
Radiator tubes, hoses and engine cooling jacket clogged with scale and sludge | 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 fan motor | Check and repair electrical chains. Replace sensors, relay or fan if necessary complete |
Damage to the valve in the filling plug neck (permanently open, causing the system to be under atmospheric pressure) | Replace filler cap |
The engine overheats, cold air comes out of 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 | Repair any coolant leak. Replace damaged cylinder head gasket |
The engine does not warm up to operating temperature for a long time, thermal regime during movement is unstable | |
Faulty thermostat (valve stuck open) | Replace thermostat |
Constant decrease in coolant level in the expansion tank | |
Leaky radiator | Replace radiator |
Expansion tank leaking | Replace expansion tank |
Coolant leaks through leaky pipe and hose connections | Tighten hose clamps |
Damaged water pump seal | Replace water pump |
Damaged water pump housing o-ring | Replace o-ring |
Mounting bolts not tightened enough cylinder heads (during prolonged parking in cold the engine has a coolant leak at the junction of the block head with the cylinder block, in addition, traces of coolant in engine oil) | Tighten the block head bolts cylinders with the required torque (see «Replacing the cylinder head gasket»). Replace damaged gasket, repair plug tightness |
Heater radiator leaking | Replace heater core |