Flushing cooling and heating system - RA20001040150X(20-0150)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Preceding work:

Warning instructions when hood open (01-0085)

Coolant drained Draining, pouring in coolant - anti-freeze protection table

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

Fig 1: Identifying Cooling And Heating System Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Coolant thermostat	remove and install pressure-opened thermostat part no. 000 589 74 63 00, remove (step 1).
Flushing connection pipe (01)	install and connect tap water hose (steps 2 and 3).
Cooling system	flush (steps 4 to 9).
Cooling system	check for leaks Testing cooling system for leaks .

Special tools

Fig 2: Identifying Flushing Connection Pipe (117 589 00 90 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Pressure-Opened Thermostat (000 589 74 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

WORKSHOP EQUIPMENT

Anticorrosion /antifreeze agent

000 989 08 25

NOTE: High coolant temperatures and low heating capacity may be caused, for example, by deposits of corrosion products in the radiator or in the heat exchanger.

The deposits are recognizable as a jelly-like mass or, when the radiator is emptied and dry, from a grey layer on the radiator connection pipes.

In this case, flush the cooling and heating system with water.

If the cooling pipes of the radiator are already completely or partially clogged by deposits, the radiator must be replaced.

Procedure

Remove coolant thermostat and install pressure-opened thermostat 000 589 74 63 00 with seal.

Fig 4: Identifying Pressure-Opened Thermostat
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fit flushing connection pipe (01) 117 589 00 90 00 together with connection hose (02) between radiator and coolant hose.
Fit a tap water hose (03) onto the flushing connection pipe (01).

Fig 5: Identifying Flushing Connection Pipe, Connection Hose And Water Hose
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Open cap of expansion reservoir.
Set heater to "warm".
If model fitted with circulation pump, switch on circulation pump.
To do this, switch on ignition and:
1. On models with automatic heater, set temperature selectors to "Max" position.
2. On models with air conditioning (automatic), press "Defrost" push-button.
Open bleeder valve of auxiliary heater.
Run engine at about 2500 rpm and flush cooling and heating system for about 15 minutes with flowing water.
The cooling system must always be completely filled during the flushing operation.

Regulate the quantity fed in accordingly.
Drain the flushing water completely in the radiator and crankcase; tighten drain plugs (17 and 82). Replace seal (18).
Remove flushing connection pipe and connect coolant hose to the radiator.
Install normal coolant thermostat with new seal.
On models fitted with stationary heater, connect plastic hose to bleeder valve and open valve.
Pour in fresh coolant Draining, pouring in coolant - anti-freeze protection table .
Check cooling system for leaks Testing cooling system for leaks .