Pour in coolant and bleed cooling system - AR20.00-P-1142-04A

Fig 1: Identifying Tester Cap (169 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Vacuum-Type Cooling System Filler (285 589 00 21 00)

Courtesy of MERCEDES-BENZ USA

test cap:

Test cap 169 589 00 91 00 for model 168

Test cap 210 589 00 91 00 for all except model 168

Only vent cooling system for a cold engine

Unscrew cooling system closure cap (10) and screw on test cap (2) at coolant expansion reservoir (1).
Attach the control unit (3) to the test cap (2) .
Attach the venturi nozzle (9) to the control unit (3).
Close the drain valve (8) and the feed valve (7).
Shown on model 171 with engine 272

Fig 4: Identifying Cooling System Bleeding Procedure - Shown On Model 171 With Engine 272
Courtesy of MERCEDES-BENZ USA
Attach feed hose (4) of the coolant to coolant reservoir (4a)
To avoid suctioning in of air put at least 2 l more coolant in the coolant reservoir (4a) than the maximum filling capacity of the cooling system.
Guide waste air hose (5) into an empty container (5a)
Connect compressed-air hose (6) to venturi nozzle (9) and apply pressure.
Open the drain valve (8).
A vacuum is created in the cooling system.
Open feed valve (7) until feed hose (4) has filled with coolant.
Close drain valve (8) if display of the control unit (3) is in the green area.
Detach compressed air hose (6) from the venturi nozzle (9) and monitor whether vacuum remains stable for 30 seconds.
If this is not the case, check hoses and connections and if necessary, repair and create a new vacuum.
Open feed valve (7).
The cooling system is filled.
Open the drain valve (8) if coolant is no longer suctioned.
Remove control unit (3) along with all connections and test cap (2)
Fill coolant up to bottom edge of filler neck of coolant expansion reservoir (1).
Screw cooling system closure cap (10) onto coolant expansion reservoir (1).