Home Repair and Service Manual Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine

Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine

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Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine

The following article gives detailed instructions on replacing the electric water pump in BMW vehicles with the N20 four cylinder engine.
Not sure which engine you have in your BMW? Use our engine finder tool to easily identify it!
Possible Symptoms: Engine overheating, higher than normal coolant temp, coolant leak from under front of engine
This repair can be used on the following BMW models:
Advanced level repair.

Step 1 - Purchase Parts

You will need the following parts and supplies to perform this repair.

Water Pump

The water pump on your BMW takes a pounding...not only is it mounted against the engine block but it has to pump thousands of gallons of hot coolant through its lifespan. These brutal conditions take a toll on the mechanical parts so only the best built water pumps survive! This Genuine BMW water pump is the same factory unit that would be installed at the dealership. Don't get sucked in by cheaper aftermarket water pumps...they are not built the same as a factory pump

Step 2 - Repair Procedure

Unless otherwise noted, all vehicle repair step images in this article are copyrighted, and used courtesy of BMW of North America, Inc. .
Before starting this repair, the coolant system must be drained.

Please see our article Coolant Flush and Replacement – BMW N20 Turbo 4 Cylinder Engine for detailed instructions on draining and refilling the cooling system.

1. Replacing the water pump
Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine
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- Remove the front plastic underbody protection panel.

View part diagram for this step
Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine
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- Remove the front belly pan (2).

View part diagram for this step
Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine
Click to enlarge image

- Locate the electric water pump. It is attached to lower right side of the engine block.

View part diagram for this step
Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine
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- Remove the two lower external torx bolts that anchor the water pump to the side of the engine.

View part diagram for this step
Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine
Click to enlarge image

- Loosen the hose clamps (1) on the two front coolant lines as shown in the image.

View part diagram for this step
Water Pump Replacement – BMW N20 Turbo 4 Cyl. Engine
Click to enlarge image

- Remove the coolant lines (1) and (2).

- Unplug the water pump (4).

- Remove the upper mounting bolt (3).

- Grasp the water pump and carefully remove it from the engine compartment.

View part diagram for this step
2. Final installation notes and torque values

- Make sure all of the coolant hoses are firmly attached.

- Water pump to engine block mounting bolts 21.6 Nm (16 ft lb).

- Refill and bleed the coolant system following the instructions in our article Coolant Flush and Replacement – BMW N20 Turbo 4 Cylinder Engine.

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