0100 - Draining,pouring in coolant, anti-freeze protection table Engine 104

Preceding work:

Bottom engine compartment panel removed
(Maintenance Manual 6190).

Operation no. of operation texts and work units or standard texts and flat rates:

20-1142-1151

Cap (1)

turn anti-clockwise as far as detent 1, turn
2-stage cap in model 210 half a turn, to release pressure.



Cap (1) must not be opened unless coolant temperature below 90 °C.

Risk of scalding!

Cap (1)

turn further to detent 2, turn 2-stage cap in model 210 further, and remove.

Draining coolant at radiator

Hose (inner dia. 12 mm)

fit onto connection (arrow).

Drain plug (3)

open, close.

Coolant

drain into suitable vessel.

Draining coolant at crankcase

Hose (inner dia. 14 mm)

fit onto drain plug (4).

Drain plug (4)

open, close (30 Nm).

Coolant

drain into a suitable vessel.

Pouring in coolant, bleeding system

Model 124:

pour in coolant up to marking (arrow) on expansion reservoir (2).

Models 129, 140, 202:

pour in coolant up to separation between top part of expansion reservoir (black) and bottom part (transparent).

Model 210:

pour in coolant up to marking (cast lug, visible when cap open) on the floor of expansion reservoir.

Heater

switch on.

Model 210:

unscrew temperature sensor at coolant thermostat housing, screw in as soon as coolant flows out.

Engine

warm up at moderate revs until coolant thermostat opens.

Models with auxiliary heater:

bleed auxiliary heater (83-1165).

Coolant level

top up to marking or to separation line on expansion reservoir.

Filler neck on expansion reservoir

close from a coolant temperature of about
60 - 80 °C; model 210: pay attention to note.

Coolant

test for resistance to low temperatures.

Cooling system

check for leaks (20-0170).

Drain plug of radiator (reference value)

1.5

Drain plug of crankcase

30

Anticorrosion/antifreeze tester
FT 2020

e. g. Leitenberger
Bahnhofstraße 23
72138 Kirchentellinsfurt

Model

Engine

Cooling system with heater

Anticorrosion

Antifreeze

-37 °C
(50 %
by vol.)

-45 °C
(55 %
by vol.)

124

104 3)

9

4.5

5

9.5 4)

4.75

5.25

129

104

11.5

5.75

6.25

140

104

14.5

7.25

8.0

202

104

10

5.0

5.5

10.54)

5.25

5.75

210

104

8.0

4.0

4.5

8.54)

4.25

4.75

Note

Coolant composition for anti-freeze protection down to -37 °C

50 % by vol. water (Mercedes-Benz Specifications for Service Products).

50 % by vol. anti-corrosion/anti-freeze agent (Mercedes-Benz Specifications for Service Products).

A higher concentration is only of practical use at lower ambient temperatures.

55 % by vol. anti-corrosion/anti-freeze agent offers anti-freeze protection down to
approx. -45 °C.

More than 55 % by vol. anti-corrosion/anti-freeze agent reduces the anti-freeze protection and impairs heat dissipation.



Disposal of coolants

The anti-corrosion/anti-freeze agents approved in the Mercedes-Benz Specifications for Service Products are biodegradable substances.

Observe national legislation and local waste water regulations.

For workshop locations in Germany refer to Environmental Protection Catalogue of MBVD/PWU.

Operational monitoring of coolant

Check the coolant for its resistance to cold temperatures before the start of the cold season.

In countries with high outside temperatures, check anti-corrosion/anti-freeze agent concentration once a year.

The corrosion protection of the coolant is degraded during operation. Such coolants have a severely corrosive effect.

The maximum period of use of a specified coolant in car engines is 3 years.

When topping up (after loss of coolant), it must be ensured that an anti-corrosion/anti-freeze agent concentration of 50 % by vol. exists in the coolant to provide anti-freeze protection down to -37 °C.



Before pouring in fresh coolant, the cooling and heating system must be free of used coolant and of corrosion residues; for this reason, clean cooling and heating system.

Anti-corrosion/anti-freeze agent

Anti-corrosion/anti-freeze agent performs the following tasks:

 ensuring adequate corrosion and cavitation protection for all components

 providing anti-freeze protection

 increasing the boiling point

Use only approved anti-corrosion/anti-freeze agents (see Mercedes-Benz Specifications for Service Products).

Water

Use water which is clean and not too hard. Drinking water frequently, but not always, satisfies requirements. The content of dissolved substances in the water may be of significance for the occurrence of corrosion. If the water quality is not known, distilled or fully desalinated water should be used. For water quality see Mercedes-Benz Specifications for Service Products.