System type
4 cylinder gasoline engines - High pressure system, with crossflow or downflow radiator, radiator fan driven by accessory drive belt with electromagnetic clutch, centrifugal type water pump driven by auxiliary belt, bypass thermostat and remote expansion tank.
6-cylinder gasoline engines - High pressure system, with cross or downflow radiator, radiator fan driven by accessory drive belt with viscous gearing, centrifugal type water pump driven by auxiliary belt, bypass thermostat remotely mounted expansion tank and overflow tank.
Diesel Engines - High pressure system, with cross or downflow radiator, radiator fan driven by accessory drive belt with thermostatically controlled thermo-viscous or electromagnetic engagement, centrifugal type water pump driven by auxiliary belt, bypass thermostat, separate expansion tank and overflow tank.
General
Pressure cap opening pressure:
- Models produced before 1987 - 1.2 bar
- Models after 1987 - 1.4 bar
Maximum coolant temperature:
- Models of release before 1987 - 125°C
- Models after 1987 - 129°C
Radiator Fan Solenoid Engagement Thermal Switch:
- Turn-on temperature - 102°C max
- Switch-off temperature - 98°С
Thermostat
Petrol engines:
- Beginning of opening — 87±2°С
- Fully open - 102°C
Naturally aspirated diesel engines:
- Beginning of opening — 85±2°С
- Fully open - 94°C
Turbocharged diesel engines:
- Beginning of opening — 80±2°С
- Fully open - 100°С
Coolant
Type - Soft water and antifreeze approved by Mercedes
Percentage of water and antifreeze: *
- Protection up to -37°C - 50% water and 50% antifreeze by volume
- Protection up to -45°C - 45% water and 55% antifreeze by volume
*Note: Do not use more than 55% antifreeze coolant, as this will impair heat dissipation and impair the anti-freeze effect.
Cooling capacity:
4-cylinder petrol engines:
- With automatic heating system - 8.5 liters
- With air conditioning - 9.5 liters
6-cylinder petrol engines:
- With automatic heating system - 9.0 liters
- With air conditioning - 9.5 liters
4-cylinder 2.0 liter diesel engines:
- With automatic heating system - 8.5 liters
- With air conditioning - 9.0 liters
5-cylinder 2.5 liter naturally aspirated diesel engines:
- With automatic heating system - 9.0 liters
- With air conditioning - 9.5 liters
5-cylinder 2.5 liter diesel engines
- turbocharged (all models) - 9.0 liters
Connection tightening torque, N·m
Water pump to crankcase/ignition timing cover:
- 4-cylinder petrol engines - 10
- 6-cylinder petrol engines - 23
- Diesel engines - 10
Water pump to housing (diesel engines) — 10
Water Pump Belt Pulley:
- 4-cylinder petrol engines - 15
- 6-cylinder petrol engines - 10
- Diesel engines - 15
Radiator fan to electromagnetic/viscous clutch:
- 4-cylinder petrol engines - 25
- 6-cylinder petrol engines 10
- 4-cylinder diesel engines - 25
- 5-cylinder diesel engines - 10
Radiator fan viscous clutch to water pump/bearing housing - 45
Solenoid coupling to water pump/support bracket - 6
Radiator drain plug - 2
Thermostat housing cover:
4 cylinder petrol engines:
- With a metal thermostat housing - 10
- With plastic thermostat housing - 8
6 cylinder petrol engines - 6
Diesel engines - 10
Thermostat housing to cylinder head (only for 4 cylinder petrol engines) — 20
Alternator Support Bracket Bolts - 45
Plug of a drain opening of the block of cylinders — 30
Automatic Transmission Fluid Heat Exchanger Connections - 20