Draining and filling the cooling system (Mercedes-Benz S-Class W116)

When the engine is hot, slowly open the expansion tank cap and release the steam. In any case, the coolant temperature should not exceed 90°C.

Turn both body heater taps on the front panel to the "Warm" position.

Unscrew the drain plug in the lower radiator tank.

Unscrew the plug or plugs (in an 8-cylinder engine) in the cylinder block (on the right side behind the front engine mount bracket in a 6-cylinder engine). In eight-cylinder engines, do not confuse with the crankshaft main bearing cap bolts (see fig. 35).

After draining the coolant, screw in the drain plugs and tighten them. Tighten the plug in the radiator with a screwdriver; tighten the plugs on the cylinder block to a torque of 30 Nm for 6-cylinder engines.

To ensure that the cooling system is filled without air locks, perform the work in the following sequence:

In vehicles with or without air conditioning, fully open the body heater valve.

Fill with antifreeze (see section 5.1.1) into the radiator or expansion tank up to the "Kalt" (cold) mark. Do not close the plug.

Start the engine and bring the engine temperature to operating condition, i.e. until the thermostat opens. Close the plug when the coolant temperature is 60...70°C.

Check the coolant level.

Material borrowed from an online resource [www.mercedesman.ru]