Overheat
- Low coolant level
- The pressure cap is faulty
- Thermostat stuck in closed position
- The drive belt is broken (4 cylinder engines only)
- Thermal switch is faulty (break)
- The cooling fan motor is faulty
- The radiator matrix is clogged
Slow warm up
- Thermostat stuck open
- The thermal switch is faulty (short circuit)
Loss of coolant
- The hose is deteriorated
- Leak from water pump or cooling system connection
- Blown cylinder head gasket
- Radiator leak
- Leak through the core plug
[The article is a reprint of material from AUDIMANUAL.RU]