The Infamous Water Pump Replacement

d99 · 07-29-2019, 05:22 PM

Hey all,

I have fall victim to the dead water pump on my 12 bmw 335is. The bill is not cheap, and after a lot of reading on here, many replace the thermostat also at the same time. Is this really required? Does the thermostat crap out shortly after the water pump? I've heard mixed results about whether to change it or not. I plan on keeping the car for maybe another year, two years tops, and it's got 85K (Km) on it (52K Miles). Do you all suggest spending the extra money on the thermostat, even though it doesn't need replacing?

Thanks!

320IN54 · 07-29-2019, 05:30 PM

the thermostat is replaced at the same time because it can only be removed when the water pump is removed. It doesnt have to go bad to be replaced but is replaced at the same time due to convenience. Also many kits come with both as the thermostat is only like 70 bucks while the water pump is like 300

Serf27 · 07-29-2019, 05:35 PM

Yes, I suggest replacing it because you will already have access to it, and it would be a shame to do all that work all over again.

d99 · 07-30-2019, 01:25 AM

Thanks. Didn't realize the low cost of parts. The job is running me $1130 for the water pump and $1356 with the thermostat included. Just trying to determine which route to go.

mweisdorfer · 07-30-2019, 02:56 AM

Your $$$$ figures seem really high. You must not be DIYing it? You can buy the water pump, thermostat & U shaped connector pipe for under $400.00 total.

It's not a bad DIY really..

TheMidnightNarwhal · 07-30-2019, 12:01 PM

Quote:

Originally Posted by 320IN54

the thermostat is replaced at the same time because it can only be removed when the water pump is removed. It doesnt have to go bad to be replaced but is replaced at the same time due to convenience. Also many kits come with both as the thermostat is only like 70 bucks while the water pump is like 300

Not true ta all. I changed my thermostat only on my 335is earlier this year without removing water pump since only the T stat went bad.

But yeah if you are already doing water pump I would T stat since T stat part is only around 50$.

rsyed07 · 07-31-2019, 09:17 AM

This is like a 3 to 4 out of 10 on the DIY scale. Very easy to access and do with some basic tools. Hardest part is bench pressing in the water pump while aligning in the 2 bolts and accessing the hard to reach bolt on top of the water pump if you don't have the proper tool. I changed mine at 70k miles on my first IS as a preventive measure. Currently at 61k on my replacement IS so will be doing the same eventually.

07-29-2019, 05:22 PM	#1
d99 New Member 2 Rep 20 Posts Drives: 2012 335IS Join Date: Feb 2017 Location: Toronto iTrader: (0)	The Infamous Water Pump Replacement - 335is Hey all, I have fall victim to the dead water pump on my 12 bmw 335is. The bill is not cheap, and after a lot of reading on here, many replace the thermostat also at the same time. Is this really required? Does the thermostat crap out shortly after the water pump? I've heard mixed results about whether to change it or not. I plan on keeping the car for maybe another year, two years tops, and it's got 85K (Km) on it (52K Miles). Do you all suggest spending the extra money on the thermostat, even though it doesn't need replacing? Thanks!
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07-29-2019, 05:30 PM	#2
320IN54 First Lieutenant 123 Rep 331 Posts Drives: 2007 BMW 335i, 2021 BMW M2C Join Date: Jan 2017 Location: Irvine iTrader: (0)	the thermostat is replaced at the same time because it can only be removed when the water pump is removed. It doesnt have to go bad to be replaced but is replaced at the same time due to convenience. Also many kits come with both as the thermostat is only like 70 bucks while the water pump is like 300
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07-29-2019, 05:35 PM	#3
Serf27 Brigadier General 2851 Rep 4,322 Posts Drives: 335i Join Date: Apr 2018 Location: Sitting in a BMW. iTrader: (-1)	Yes, I suggest replacing it because you will already have access to it, and it would be a shame to do all that work all over again.
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07-30-2019, 01:25 AM	#4
d99 New Member 2 Rep 20 Posts Drives: 2012 335IS Join Date: Feb 2017 Location: Toronto iTrader: (0)	Thanks. Didn't realize the low cost of parts. The job is running me $1130 for the water pump and $1356 with the thermostat included. Just trying to determine which route to go.
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07-30-2019, 02:56 AM	#5
mweisdorfer Major General 1903 Rep 6,968 Posts Drives: 2007 Black/Black 335i e90 Join Date: Apr 2011 Location: Holly, MI iTrader: (0) Garage List 2007 BMW E90 335i [0.00] 2008 bmw x5 [0.00]	Your $$$$ figures seem really high. You must not be DIYing it? You can buy the water pump, thermostat & U shaped connector pipe for under $400.00 total. It's not a bad DIY really..
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07-31-2019, 09:17 AM	#7
rsyed07 Captain 175 Rep 595 Posts Drives: E46 330i, E92 13' 335is Join Date: Jun 2016 Location: Central FL iTrader: (0)	This is like a 3 to 4 out of 10 on the DIY scale. Very easy to access and do with some basic tools. Hardest part is bench pressing in the water pump while aligning in the 2 bolts and accessing the hard to reach bolt on top of the water pump if you don't have the proper tool. I changed mine at 70k miles on my first IS as a preventive measure. Currently at 61k on my replacement IS so will be doing the same eventually.
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