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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > what are symptoms of a bad water pump?



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      07-23-2012, 06:53 PM   #1
az335idesi
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what are symptoms of a bad water pump?

So last night i was in a garage, and i noticed a LOUD fan noise. I dont think i have noticed this before, but the temps here right now are close 100F...but back to the story, so i turned off the a/c, and the noise went away. Is this normal? or should i expect the water pump to give out soon?

*EDIT*: i am going on a 2000+ mile trip in a couple of weeks, is there anything i should check/do before i head out? anything to keep an eye out on?

Last edited by az335idesi; 07-25-2012 at 07:15 PM. Reason: add
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      07-23-2012, 07:18 PM   #2
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Quote:
Originally Posted by az335idesi View Post
So last night i was in a garage, and i noticed a LOUD fan noise. I dont think i have noticed this before, but the temps here right now are close 100F...but back to the story, so i turned off the a/c, and the noise went away. Is this normal? or should i expect the water pump to give out soon?
The "loud fan noise" is normal with the AC on...
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      07-23-2012, 07:32 PM   #3
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My water pump just went out. Car overheated and went into limp mode. Then it worked fine for the night (guess it kicked back in for a while) and the next day shut off after just a mile of driving. My mechanic was able to isolate and test the pump with his computer and show me that for now it's intermittent and works for only a minute before it dies, but it's failing fast. Make sure your engine/water temp isn't getting too high if you have that gauge. The fan is bound to be a bit louder with the AC on though.
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      07-23-2012, 07:40 PM   #4
GeorgiaTech335coupe
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Only symptom my water pump gave before it went out was the red thermostat warning light about the same time it died.
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      07-23-2012, 08:30 PM   #5
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Quote:
Originally Posted by GeorgiaTech335coupe
Only symptom my water pump gave before it went out was the red thermostat warning light about the same time it died.
Same here.

However they will trigger shadow codes when they are in the "failing" stage of their life.
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      07-24-2012, 01:24 PM   #6
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Quote:
Originally Posted by Gugs View Post
However they will trigger shadow codes when they are in the "failing" stage of their life.
Can these shadow codes be read by a code reader, or are they something that can only be seen by the dealer?
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      07-24-2012, 01:28 PM   #7
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Quote:
Originally Posted by wonho View Post
Can these shadow codes be read by a code reader, or are they something that can only be seen by the dealer?
Generic code readers cant read shadow codes.

You would need a bavarian technic tool or BMW diagnostics tools.
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      07-24-2012, 03:15 PM   #8
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
Generic code readers cant read shadow codes.

You would need a bavarian technic tool or BMW diagnostics tools.
How about AccessPort? Thanks btw.
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      07-24-2012, 03:37 PM   #9
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Quote:
Originally Posted by Gugs View Post
Same here.

However they will trigger shadow codes when they are in the "failing" stage of their life.

Not always, I was betting on getting a code before the pump's impending death so I can schedule the replacement. I got nothing, it went from no codes/symptoms to yellow warning to red temp warning within a minute. Game over.
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      07-24-2012, 04:10 PM   #10
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^^^^ Same went for me.
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      07-24-2012, 05:56 PM   #11
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I don't know if my car threw any codes but on 3 occasions in 1 weeks time the fan went into kill mode and I guess lucky for me it was stuck in the open position and my oil temps plummeted. I replaced the water pump and therm and the problem has been resolved
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      07-25-2012, 07:16 PM   #12
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i am going on a 2000+ mile trip in a couple of weeks, is there anything i should check/do before i head out? anything to keep an eye out on?
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      07-25-2012, 09:19 PM   #13
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Quote:
Originally Posted by PeterM1


Not always, I was betting on getting a code before the pump's impending death so I can schedule the replacement. I got nothing, it went from no codes/symptoms to yellow warning to red temp warning within a minute. Game over.
That's why they are called shadow codes. They will pop up in the dme
But they don't trigger an error on dash or cell. They often will trigger and even disappear after a short while like it never happened. I'm assuming this is to account for normal sensor glitches.

Only way to see them is to get lucky and catch them or what usually happens is the shadow code will trigger 3 times and it will actually show a cel.
In your case the part just failed all together creating a major error event
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      12-04-2014, 08:08 PM   #14
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I know I'm late on this but this may help anyone searching the forums in the future. My mechanic told me mine is about to give out. His reasoning was that passenger side of the radiator was cold, and the driver side was hot because the pump was not currently working sufficiently (or something to that effect).
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      12-04-2014, 10:30 PM   #15
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Quote:
Originally Posted by l2odrigomichel
I know I'm late on this but this may help anyone searching the forums in the future. My mechanic told me mine is about to give out. His reasoning was that passenger side of the radiator was cold, and the driver side was hot because the pump was not currently working sufficiently (or something to that effect).
What's your mileage?
Is your fan always blowing loudly?
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