Technical characteristics of the cooling system (Mercedes-Benz E-Class W124)

Models with 4-cylinder petrol engines	Sealed cross-flow or down-flow radiator; radiator fan with auxiliary drive belt and electromagnetic clutch; centrifugal water pump with auxiliary drive belt; thermostat and separately installed expansion tank
Models with 6-cylinder petrol engines	Sealed cross-flow or down-flow radiator; radiator fan with auxiliary drive belt and thermoviscous clutch, centrifugal water pump with auxiliary drive belt; thermostat and separately located expansion tank
Diesel engines	Sealed cross-flow or down-flow radiator; radiator fan with auxiliary drive belt and thermoviscous or electromagnetic clutch; centrifugal water pump driven by an auxiliary drive belt; thermostat and separately located expansion tank
Opening pressure of the relief valve:
- models before 1987	1.2 bar
- models since 1987	1.4 bar
Maximum coolant temperature:
- models before 1987	125°C
- models since 1987	129°C
Radiator Fan Electromagnetic Clutch Temperature Sensor
Switch-on temperature	102°C
Shutdown temperature	98°C

Petrol engines:
– opening start temperature	87±2°C
– full opening temperature	102°C
Diesel engines without turbocharging:
– opening start temperature	85±2°C
– full opening temperature	94°C
Turbocharged diesel engines:
– opening start temperature	80±2°C
– full opening temperature	100°C

Type	A mixture of distilled water and antifreeze
Ratio of components:
– protection up to temperature – 37°C	50% water and 50% antifreeze
– protection up to temperature – 45°C	45% water and 55% antifreeze
Coolant quantity:
– 4-cylinder petrol engines:
• with automatic heating system	8.5 l
• with air conditioning	9.5 l
– 6-cylinder SOHC petrol engines:
• with automatic heating system	9.0 l
• with air conditioning	9.5 l
– 6-cylinder DOHC engines	9.0 l
– 4-cylinder diesel engines:
• with automatic heating system	8.5 l
• with air conditioning	9.0 l
– 5-cylinder diesel engines without turbocharging:
• with automatic heating system	9.0 l
• with air conditioning	9.5 l
– 5-cylinder turbocharged diesel engines	9.0 l
– 6-cylinder diesel engines without turbocharging:
• with automatic heating system	9.0 l
• with air conditioning	9.5 l
– 6-cylinder turbocharged diesel engines	10.0 l

Water pump to cover:
– 4-cylinder petrol engines	10 Nm
– 6-cylinder petrol engines	23 Nm
- diesel engines	10 Nm
Water pump pulley:
– 4-cylinder engines	15 Nm
– 6-cylinder SOHC engines	10 Nm
– 6-cylinder DOHC engines	15 Nm
- diesel engines	15 Nm
Radiator fan to electromagnetic or thermoviscous clutch:
– 4-cylinder engines	27 Nm
– 6-cylinder SOHC engines	10 Nm
– 6-cylinder DOHC engines	10 Nm
– 4-cylinder diesel engines	25 Nm
– 5- and 6-cylinder diesel engines	10 Nm
Thermoviscous coupling of radiator fan to water pump	45 Nm
Electromagnetic clutch for water pump	6 Nm
Radiator Coolant Drain Plug	2 Nm
Thermostat housing cover:
– 4-cylinder petrol engines:
• with metal thermostat housing	10 Nm
• with plastic thermostat housing	8 Nm
– 6-cylinder petrol engines	6 Nm
- diesel engines	10 Nm
Thermostat housing to cylinder head on 4-cylinder petrol engines	20 Nm