Coolant Recirculation Pump (V50)

Coolant Recirculation Pump (V50)

Special tools, testers and auxiliary items required

• Hose Clamps up to 25 mm Diameter (3094)

• Hose Clamp Pliers (VAS 6340)

Removal






There is a risk of scalding from hot steam and coolant.

• The coolant system is under pressure when the engine is warm.

• To reduce the pressure, cover the coolant reservoir cap with several cloths and then open it carefully.

- Open the coolant reservoir cap - arrow -.

- Remove the plenum chamber cover.






- Remove the fresh air intake duct. Refer to => [ Fresh Air Intake Duct ] Fresh Air Intake Duct.

- Label the arrangement of the coolant hoses.

- Cover the area under the pump with an absorbent rag or paper.

- Clamp off the coolant hoses - 5, 6 - with hose clamps (3094) and remove from the pump by releasing the hose clips.

- Disconnect the electrical harness connector - 2 -.

- Pull the bracket - 1 - out of the clip nuts.

- Unscrew the bolts - 3 - and remove the pump - 4 -.

Installation

Installation is done in reverse order, observe the following:

• Secure all hose connections with hose clamps used in series production. Refer to Electronic Parts Catalog (ETKA).

• Ensure that these components do not come in direct contact with the body or do not touch other components.

- When attaching the coolant hoses, ensure that as little air as possible remains in the pump and the coolant hoses. Refer to => [ Bleeding the Coolant Circuit ] Bleeding the Coolant Circuit.

• Pay attention to the flow direction of the coolant at the Coolant recirculation pump/ Coolant shut-off valve (N82).

• Ensure proper arrangement of the coolant hoses at the Coolant recirculation pump/Coolant shut-off valve.

• Interchanged coolant hoses can result in failure of the passenger compartment heater due to the incorrect flow direction of the coolant.

• Crushed coolant hoses can result in failure of the passenger compartment heater due to the insufficient coolant flow quantity.

- Tighten the screws - 5 - to 1.5 Nm.






- The bracket - 4 - must be pressed completely into the clip nuts - 6 -.

- Install the fresh air intake duct. Refer to => [ Fresh Air Intake Duct ] Fresh Air Intake Duct.

- Check the coolant level and bleed the coolant circuit while observing the relevant instructions. Refer to => [ Bleeding the Coolant Circuit ] Bleeding the Coolant Circuit.

- Check the activation and function of the Coolant recirculation pump using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

- Install the plenum chamber cover.