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Auxiliary Coolant Pump Replacement
 
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Pelican Technical Article:

Auxiliary Coolant Pump Replacement

Nick Czerula

Time:

3 hour3 hr

Tab:

$400

Talent:

****

Tools:

7mm socket, flathead screwdriver

Applicable Models:

R56 MINI Cooper S Hatchback (2007-13)

Parts Required:

Auxiliary coolant pump, engine coolant

Hot Tip:

Work with a cool engine

Performance Gain:

Car will cool down again, coolant leak repaired

Complementary Modification:

Change the radiator hoses and flush the cooling system

The MINI R56 cooling system is filled through the plastic coolant expansion tank (or coolant reservoir) at the right front of the engine compartment. There is no cap on the radiator. Other components of the cooling system consist of:

Belt driven coolant pump bolted to the right side of the engine block.

Turbocharged engines: Electric coolant pump bolted to the left front of the engine block.

Turbocharged engines: Engine oil cooler attached to oil filter housing.

Electric cooling fan attached to rear of radiator. The cooling fan is controlled by the engine control module (ECM) via an output final stage.

Electrically heated thermostat.

Automatic transmission cooler (heat exchanger).

Coolant temperature sensor at cylinder head.

Coolant hose and lines.

The auxiliary coolant pump is used to supplement the engine coolant pump to help with turbocharger cooling. It is mounted to the engine block, below the turbocharger. After the engine is shut off, the electric cooling fan may continue to run after the engine is shut off in two different scenarios. The system is operating as designed.

1. When the engine coolant temperature reaches 108 degrees Celsius (due to heat soak), the cooling fan will activate until the coolant temperature drops below 105 degrees Celsius. During this period, the fan has a maximum run time of 900 seconds (15 minutes) due to power management. Ambient or oil temperature has no effect on this run time.

2. On Cooper S vehicles with the N14 engine, the fan will run to assist the auxiliary water pump, which is used to cool the turbocharger after engine shut down. The maximum run time in this situation is 300 seconds (5 minutes).

When a coolant pump begins to fail, the check engine light will illuminate to warn you of the issue. Fault codes will be stored:

For N14:

2F37 - auxiliary water pump, actuation, open circuit

2F36 - auxiliary water pump, actuation, short-circuit to earth

2F35 - auxiliary water pump, actuation, short-circuit to positive

For N18:

3786 - auxiliary coolant pump, actuation, open circuit

3785 - auxiliary coolant pump, actuation, short-circuit to earth

3784 - auxiliary coolant pump, actuation, short-circuit to positive

Be sure to work with a cool engine and confirm the cooling system lacks pressure before opening the cooling system.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Drain the cooling system. See our tech article on Cooling System Draining and Filling.

Place the radiator support into the service position. See our tech article on radiator support service position. This is not necessary, but will give you much more room to work.

The auxiliary coolant pump (green arrow) is used to supplement the engine coolant pump to help with turbocharger cooling.
Figure 1

The auxiliary coolant pump (green arrow) is used to supplement the engine coolant pump to help with turbocharger cooling. It is mounted to the engine block, below the turbocharger (red arrow).

Start by removing the coolant expansion tank 7mm fastener (green arrow).
Figure 2

Start by removing the coolant expansion tank 7mm fastener (green arrow).

Detach the expansion tank from the radiator support by lifting the rear up then removing it from the radiator support.
Figure 3

Detach the expansion tank from the radiator support by lifting the rear up then removing it from the radiator support. Place the expansion tank aside. Leave the hoses connected.

Using a flathead screwdriver, loosen the turbocharger duct hose clamp (red arrow).
Figure 4

Using a flathead screwdriver, loosen the turbocharger duct hose clamp (red arrow).

Once the clamp is loose, pull the duct off the turbocharger.
Figure 5

Once the clamp is loose, pull the duct off the turbocharger.

Working at the pump, disconnect the electrical connector by pressing the release tab (red arrow) and pulling the connector straight off.
Figure 6

Working at the pump, disconnect the electrical connector by pressing the release tab (red arrow) and pulling the connector straight off.

Then using hose clamp pliers, remove both coolant line hose clamps (red arrows).
Figure 7

Then using hose clamp pliers, remove both coolant line hose clamps (red arrows). Slide them down the hoses far enough to free the hoses. Replace these clamps with new ones.

Place a drain pan under the engine.
Figure 8

Place a drain pan under the engine. Then remove the hoses and allow the remaining coolant to drain into the pan (green arrow).

Remove the wiring harnesses from the mounts (green arrows).
Figure 9

Remove the wiring harnesses from the mounts (green arrows). Then remove both 10mm coolant pump fasteners (red arrows).

Remove the auxiliary coolant pump from the engine (red arrow).
Figure 10

Remove the auxiliary coolant pump from the engine (red arrow). Replace with a new one. Remember to replace the hose clamps. Once complete, check the cooling system for leaks and top up the cooling system. 



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