Engine cooling system Mercedes S-Class (W126)

The design and operating principle of the cooling system
All engines have a closed cooling system under pressure. Because of this, the boiling point rises to approximately 118°C. When using a coolant with a freezing point of...

Removal and installation the coolant pump
Drain the coolant. One drain bolt is on the radiator, the other is in the cylinder block. Loosen the power steering pump belt and remove it. Remove the radiator and fan...

Coolant pump repair
Since repair of a maintenance-free coolant pump is a complex and time-consuming task, the faulty pump must be replaced with a new one. Coolant pumps of 8-cylinder...

Thermostat — Removal, Installation and Checking
1. Thermostat cover. 3. Thermostat. 5. Gasket. 2. Gasket. 4. Thermostat housing. 6. Water pump. The thermostat opens a large circle of coolant circulation as the engine...

Drive belts — replacement and tensioning
Before installing new belts, the tensioners or units that tension the belts must be set to their original position. New belts are subject to strong initial stretching....

Radiator — removal and installation
In vehicles with automatic transmission, the transmission oil cooler is located at the bottom of the radiator. Drain the coolant. Remove the upper and lower hoses after...

Fan Motor — Removal and Installation
To remove the fan viscous coupling, unscrew the mounting bolts and remove the fan. Installation is in the reverse order of removal. A defective clutch cannot be repaired...

Checking the coolant level
The coolant level should be checked regularly - approximately every 4 weeks, at least before each long trip. Caution! Open the radiator cap with caution when the engine...

Antifreeze check
Before the cold season begins, it is necessary to check the concentration of antifreeze. A Warm up the engine until the radiator at the top reaches the temperature when...

Visual inspection of the system for leaks
Check coolant hoses for porous areas by squeezing and bending, hardened hoses should be replaced. The hoses must not sit too short on the connection nipples. Check the...

Replacing the coolant
The coolant should be replaced as part of maintenance every 3 years. Caution: If the fluid is drained during repair, it should be saved for reuse, as it contains...

Cooling system fault table
Malfunction: Coolant temperature is too high, instrument readings are in the red area. Cause Method of elimination Low coolant in the system Fill the radiator to the...

Engine Cooling and Lubrication System Specifications
Engine Cooling and Lubrication System Specifications 1* - Opening start 87±2°C (280S and 280SE), opening start 75±2°C (380SE and 500SE), minimum stroke 8 mm at 102°C...

Cooling system parts for eight-cylinder engines
1 - temperature sensor; 2 - gasket; 3 - hanging eye; 4 - bolt; 5 - bolt; 6 - inlet pipe; 7 - bolt; 8 - washer; 9 - gasket; 10 - spacer ring; 11 - water hose; 12 - clamp;...

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W140 (1991-1998)