Initial operation of new tandem pump - AR32.50-P-0021-01N

Fig 1: Identifying Pressure Pump (124 589 24 21 00)

Courtesy of MERCEDES-BENZ USA

Shown on model 220 

Air is bled from a new tandem pump when the ABC system is pressurized.

1. Connect suitable pressure hose (084a) to pressure pump (084).
2. Pull dipstick out of the expansion reservoir (2).
3. Insert the pressure hose (084a) into the fitting of the dipstick opening and press on firmly.

   2nd person required.

4. Use pressure pump (084) to produce a pressure of approx. 1 bar.
5. Start engine.
   Fig 2: Identifying Expansion Reservoir, Pressure Pump And Pressure Hose

   Courtesy of MERCEDES-BENZ USA