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      11-02-2019, 06:00 AM   #1
Shane28RG
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Imminent water pump failure?

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Hi guys,

Would appreciate a bit of advise on what I think is possibly an imminent water pump failure. I picked up a 2014 M235i with 52K about 3 weeks ago. It had been running fine. However in the last week on my daily commute a few times I have got to work and the fans have been running on what sounds like full power. One day it was only 3 degrees C outside so certainly was not hot at all and had not been driving it hard whatsoever. Its odd as it does not seem to always happen but after a bit of digging online it does not sound promising! A few questions:

1. When I looked at the temperatures in the secret menu the Oil was at 90C and the Coolant at 81C which did not seem particularly hot - is this to be expected with this problem? (everyone talks about basically the car overheating when it dies but it certainly did not seem very hot from the sensor perspective)

2. The car came from an independent though has a 12 month warranty with warrantyfirst. Looking through the warranty docs last night the warranty lists Cooling system covered parts as "water pump (non cam belt driven)". I believe it has a timing chain so do you think its covered or does that mean I am screwed from a warranty perspective?

3. Assuming it is covered - is there anyway to actually make it fail? I assume the warranty wont replace it until its died and so it feels like driving a ticking time bomb around!

Any advice appreciated. Pretty annoying considering I have only just got it and swapped it from a TT that had provided 3 trouble free years!

Thanks,

Shane
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      11-02-2019, 06:34 AM   #2
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My 17 m2 water pumped failed out if blue last feb no warning before just warning lights on HUD.
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      11-02-2019, 06:42 AM   #3
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@darlx - its so rubbish how they have not fixed something like this.

One other bit of info. Took it for a 20 minute relatively hard drive right now and drove fine. Temperatures maxed out at Oil 112C and Coolant 107C - fans were on quietly. Not sure ift thats a bit too high or not (the TT temp gauge never went above 90)..
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      11-02-2019, 12:39 PM   #4
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first thing is to inspect all the main coolant hoses particularly near their attachment points

make sure no hoses are collapsing and try a new pressure cap on the coolant tank
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      11-03-2019, 07:10 AM   #5
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These water pumps do fail in the 50-60k mile range. Unfortunately it is a fact of life with the n55. I would replace it preventatively, otherwise they fail unpredictably and the car is undriveable. Can be very inconvenient !
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      11-03-2019, 03:25 PM   #6
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My fans were going full power right before my water pump failed at 56k miles. You should just change it so you don't get stranded.
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      11-03-2019, 07:47 PM   #7
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Quote:
Originally Posted by FCBuff View Post
These water pumps do fail in the 50-60k mile range. Unfortunately it is a fact of life with the n55. I would replace it preventatively, otherwise they fail unpredictably and the car is undriveable. Can be very inconvenient !
Inconvenient,! Yeah mine 17 m2 failed 150miles from home in dead of winter. BMW roadside helped but had rental for 2 weeks while part shipped from germany. And car had only 16k miles in it!
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      11-03-2019, 09:22 PM   #8
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Quote:
Originally Posted by dalrx View Post
Inconvenient,! Yeah mine 17 m2 failed 150miles from home in dead of winter. BMW roadside helped but had rental for 2 weeks while part shipped from germany. And car had only 16k miles in it!
Lol, sorry to hear. My water pump failed at 52,000 miles (warranty ended at 50,000). My wife was driving home, car just died with no warning, on the interstate. Bmw stepped up and covered most of it, but still pain in the ass. Car now has 97,000 miles. Going to replace it soon, hopefully before it dies again.
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      11-04-2019, 09:47 AM   #9
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Curious on what the cost of replacement has been.
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      11-04-2019, 04:07 PM   #10
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About $200 at ECS Tuning.
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      11-04-2019, 07:17 PM   #11
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Should probably replace the thermostat at the same time
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      11-04-2019, 11:09 PM   #12
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damn thought these are metal water pumps now and this issue was fixed?
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      11-05-2019, 11:32 AM   #13
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62K on Original

Next Spring I will replace the WP + Thermo + OFHG + COOLANT
.
.
I expect to get at least 75K before I change & will most likely replace the belt and idler pulleys during that time as well.

All fun stuff. Will order parts on a Cyber Monday or Christmas Deal .
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      11-05-2019, 11:42 AM   #14
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Quote:
Originally Posted by seansurfn2 View Post
damn thought these are metal water pumps now and this issue was fixed?
These aren't belt driven pumps that have the plastic impellers that break like in older BMWs. These water pumps are completely electric. They simply burn out over time, typically within 6-7 years and 70K miles. Having one fail within 4 years or less is uncommon and not the norm.

Replacement is a pain because the water pump is typically buried in a jungle of hoses and squeezed between the front of the engine, suspension, subframe, and radiator. When you replace the water pump, it also makes sense to replace the thermostat.

Costs to replace at a dealer or indy shop is around $800-1,200.
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      11-08-2019, 10:28 PM   #15
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Quote:
Originally Posted by XutvJet View Post
These aren't belt driven pumps that have the plastic impellers that break like in older BMWs. These water pumps are completely electric. They simply burn out over time, typically within 6-7 years and 70K miles. Having one fail within 4 years or less is uncommon and not the norm.

Replacement is a pain because the water pump is typically buried in a jungle of hoses and squeezed between the front of the engine, suspension, subframe, and radiator. When you replace the water pump, it also makes sense to replace the thermostat.

Costs to replace at a dealer or indy shop is around $800-1,200.
ya my n54 it was all jammed into the front and was super hard to get to.
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      11-10-2019, 09:31 AM   #16
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The B58 engine has 2 water pumps. Tge main coolant pump is mechanical while the intake charge cooling pump is electric. The former goes for about $200. The electric pump goes for about the same according to a couple of BMW dealer websites.
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      11-10-2019, 10:11 AM   #17
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Quote:
Originally Posted by XutvJet View Post
These aren't belt driven pumps that have the plastic impellers that break like in older BMWs. These water pumps are completely electric. They simply burn out over time, typically within 6-7 years and 70K miles. Having one fail within 4 years or less is uncommon and not the norm.

Replacement is a pain because the water pump is typically buried in a jungle of hoses and squeezed between the front of the engine, suspension, subframe, and radiator. When you replace the water pump, it also makes sense to replace the thermostat.

Costs to replace at a dealer or indy shop is around $800-1,200.
That is simply untrue. I personally had a water pump fail at 52,000 miles. They fail at 50-60k routinely.
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      04-12-2023, 05:28 PM   #18
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Hi all, real quick, 2016 M235i N55. Owned it since 2019 at 34k miles. Now at 97.5k. Never had any issues with the pump or thermo, but I'm replacing them anyways. Is it normal to have these fail before 100k?
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      04-13-2023, 08:11 AM   #19
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usually BMW's run hotter especially the newer ones, see if it is throwing any codes as well
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      04-13-2023, 01:43 PM   #20
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Quote:
Originally Posted by Sleepless_Engineer View Post
Hi all, real quick, 2016 M235i N55. Owned it since 2019 at 34k miles. Now at 97.5k. Never had any issues with the pump or thermo, but I'm replacing them anyways. Is it normal to have these fail before 100k?
On the later N55s like those used in the M235? Not really. I've had my 2016 M235 for over 7 years and 70K miles. It's still on the stock pump and thermostat.

The pump failures occur at a far more common rate in the N54 and early N55s (pre-2014). Those pumps usually failed between 50-70K miles. The pumps themselves usually don't fail, it's the circuitry. The pumps used in the later cars have improved circuitry to handle the heat.

Once you're closing in on 8+ years and 100K miles of service, one should be prepared to replace the water pump. It is a wear item and water pump replacement at 100K miles is common regardless of brand or design. Luckily on our cars, the water pump shows signs of impending failure by running the fans often which is typically the sign that the circuity is failing. Replacement isn't overly complex, just fiddly and messy because of all the stuff in the way. It is a DIY job and burping the system is crazy easy thanks to the automated coolant burping/cycling process. Kudos to BMW for making that system.
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      04-13-2023, 02:17 PM   #21
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Repair when it fails, I have 160,000 on my 328i n52 and the pump is original and working perfect. Wasting money to replace it before it fails, you will see codes when it’s getting weak
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      09-09-2023, 10:12 PM   #22
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I’m on year 8 of my 2016 m235i on stock waterpump at 59k miles. I’ve had waterpump failures on other older n55 powered models that failed at 67k miles (F10) and 73k miles (e90) and would hope this one would last at least as many miles.


Quote:
Originally Posted by XutvJet View Post
On the later N55s like those used in the M235? Not really. I've had my 2016 M235 for over 7 years and 70K miles. It's still on the stock pump and thermostat.

The pump failures occur at a far more common rate in the N54 and early N55s (pre-2014). Those pumps usually failed between 50-70K miles. The pumps themselves usually don't fail, it's the circuitry. The pumps used in the later cars have improved circuitry to handle the heat.

Once you're closing in on 8+ years and 100K miles of service, one should be prepared to replace the water pump. It is a wear item and water pump replacement at 100K miles is common regardless of brand or design. Luckily on our cars, the water pump shows signs of impending failure by running the fans often which is typically the sign that the circuity is failing. Replacement isn't overly complex, just fiddly and messy because of all the stuff in the way. It is a DIY job and burping the system is crazy easy thanks to the automated coolant burping/cycling process. Kudos to BMW for making that system.
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