BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      03-14-2022, 01:49 PM   #1
romnation
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2009 135i at 64K miles with original water pump - When can I expect it to die?

I am 90% sure it is original at least. I am not the original owner, but the records I have don't mention anything about it ever being replaced.

Is the water pump dying usually more time-based or mileage based? The majority of my driving is inner city urban mileage so I don't rack up a lot of mileage each year. I really don't want to spend the money to pre-emptively replace it though, it is not cheap, but I do wonder how screwed I would be if it died on a long trip...
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      05-09-2022, 12:24 PM   #2
Angry3
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As a point of reference, my 08 with 71K miles is in for a failed HPFP as we speak. Results may vary of course.

One would think it might be more mile based, but my car didn't follow that theory. Anyway, hope that helps. Cheers.
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      05-09-2022, 12:33 PM   #3
markslc1
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Just do it for piece of mind. Takes an afternoon on jackstands and $500 in parts. Vs thousands at a dealer if you break down.
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      05-09-2022, 01:48 PM   #4
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I have barely 30k miles on my 11 year old 135i, and replaced the water pump a few weeks ago (it died).
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      08-10-2022, 08:55 PM   #5
Ewcmr2
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My wife’s ‘09 w/110k just had its water pump die. Fortunately she was only a mile from home so it was easy to run down in the truck to tow her home.
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      08-16-2022, 06:28 PM   #6
FactorX81
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yesterday....

Mine died at about 78k miles.
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      12-19-2022, 07:12 AM   #7
MikeD_VA
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Water Pump failed at 67k miles (2011 135)

At the end of a two hour drive I heard a loud noise coming from under the hood. Drove the car the next day for a couple of quick trips, heard noise again after shutting down. At first I thought the cooling fan was running but checked and found it wasn’t. Checked codes and found codes consistent with water pump failure (3847, 378F, 3446). With the car off the pump would run (noisily) and I could hear water circulating. No over heating.

Ordered parts (pump, thermostat, bolts, coolant) from oembimmerparts.com. The challenge was then to get the car to my weekend house where I have a lift, that is more than an hours drive. Having read other’s accounts of failure and the noise preceding the failure I decided to chance it. I used the “secret menu” to get the coolant temp displayed. Got stuck in traffic getting out of the city, never saw more than 102 C. Made the trip just fine, shut the car down and still heard the noise. The noise sounds like a weed whacker running off in the distance.

Got the car on the lift and began disassembly. Managed to drain most of the coolant without getting drenched or making a mess. Everything came apart without issue except for the larger of the two quick disconnect hoses. That required a large pry bar carefully placed so as not to break anything. Reassembly went okay except the quick disconnect needed serious force to reconnect. Put the sway bar and power steering line back in place, left the underbody cladding off so I could check for leaks later. Filled with coolant, ran the purge procedure. Got car up to temp and verified no leaks. Replaced underbody panel.

Total repair time not including research (YouTube, searching this forum) just under 5 hours. Thanks to posters that provided their accounts of failure/replacement and posting about the “secret menu”.
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      12-19-2022, 07:49 AM   #8
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Nice! Lucky that you made it the hour drive. I suppose some pumps go out on an intermittent schedule at first.
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      12-28-2022, 12:03 AM   #9
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I would change it for peace of mind given the age. Mine died randomly on a long drive between SF and LA. Had to get it towed almost 150 miles. Not fun.
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