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      08-27-2019, 09:11 AM   #1
MrSweet1991
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E90 330D - Auxiliary Water Pump Not Working

Hi All,

I got a fault for the Auxiliary Water pump a while back so I took mine off to inspect inside and a screw broke so I purchased another one off fleabay only to find the same issue. I spliced the brown wire and connected it to the ground connection on the side of the car by the expansion tank and then used ISTA to run the pump for 10 second but still nothing. The other wire red and white I think it was goes to a loom and then down by the ECU box and connects to the IHKA so I'm not sure what to do on that side of things. Also, I was going to use a multimeter to test for a voltage but when you pull the black connection off its a female connector with two small holes, so without splicing the wires how are you supposed to test the connector anyway?
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      08-30-2019, 07:11 PM   #2
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Where is this Auxiliary Water Pump in the engine bay and what's its purpose?
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      08-31-2019, 02:26 AM   #3
Tambohamilton
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Chances are that the brushes are worn out on the motor. Can be diy replaced, or new pump time. Test it by wiring it directly to the battery.
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      08-31-2019, 02:29 AM   #4
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Quote:
Originally Posted by 1 AKY View Post
Where is this Auxiliary Water Pump in the engine bay and what's its purpose?
On the left (passenger) side of the engine bay, attached to the wheel arch inside the engine bay. It's easy to spot.

Does what it says on the tin. Major function is after-run circulation, and rest heating. Generally your car will run absolutely fine without it though.
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      09-04-2019, 11:21 AM   #5
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Quote:
Originally Posted by Tambohamilton View Post
Chances are that the brushes are worn out on the motor. Can be diy replaced, or new pump time. Test it by wiring it directly to the battery.
How exactly would I run the aux pump off the battery?
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      09-04-2019, 12:17 PM   #6
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Run wires directly from the pump terminals to the jump start points under the bonnet...unless someone has a better idea?
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      09-04-2019, 02:23 PM   #7
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Quote:
Originally Posted by Tambohamilton View Post
Run wires directly from the pump terminals to the jump start points under the bonnet...unless someone has a better idea?
sounds pretty straight forward. I do have a spare battery but I think it needs charging so I'll see if I have some wire lying around that can reach.
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      09-04-2019, 02:28 PM   #8
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Quote:
Originally Posted by 1 AKY View Post
Where is this Auxiliary Water Pump in the engine bay and what's its purpose?
our UK models it's on the right hand side, attached to the wheel arch almost. can help with hot spots in engine as it can circulate the coolant after you turn the car off, but one of the benefits I wanted it for was you can put ignition on, turn blower fan speed to lowest setting, temperature to highest and then hold accelerator for thirty seconds and it will activate the auxiliary pump to automatically bleed the coolant after flushing and renewing the coolant. it also helps to keep the cabin air warm when the engine has been shut off, again because it continues to circulate the coolant
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      09-04-2019, 02:49 PM   #9
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Quote:
Originally Posted by MrSweet1991 View Post
our UK models it's on the right hand side, attached to the wheel arch almost. can help with hot spots in engine as it can circulate the coolant after you turn the car off, but one of the benefits I wanted it for was you can put ignition on, turn blower fan speed to lowest setting, temperature to highest and then hold accelerator for thirty seconds and it will activate the auxiliary pump to automatically bleed the coolant after flushing and renewing the coolant. it also helps to keep the cabin air warm when the engine has been shut off, again because it continues to circulate the coolant
Right hand side, as you look into the engine bay from the front, yes. It's on the left hand side if you're in the driving position, facing forwards... Just wanted to clarify!
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      09-06-2019, 01:50 AM   #10
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ha ha ,,get some wellies like jimmy cricket ha ha "L" "R" ha ah
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