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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Water Pump & Thermostat Install - N52



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      07-30-2011, 01:12 PM   #1
ENINTY
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Water Pump & Thermostat Install - N52

So I after 149,521 glorious miles, the water pump in my 325i died. I figured Iíd do a DIY for it using the basic procedure for a coolant change (I wrote a few years ago). Also, I replaced the thermostat a few months back so Iíll throw that in too since you need to remove it to get the pump out. I donít take pictures because it takes to long and I donít want to dirty up my nice camera. The intent of my DIYs is to provide the details of removing parts by being descriptive enough that pictures are not necessary. I find that repair manuals lack the detail of how to actually remove parts and disconnect hoses and electrical connectors, which is what I try to add. They have good pictures though.

It's long and wordy, so I've just included the MS Word document to download and print.

Note: In the maintenace section JamesUKE92 did this procedure and included pictures. I used his efforts as a guide when installing my pump last weekend. JamesUKE92 was the first memebr I saw who attempted the T-Stat and pump replacement. Kudos to James!
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File Type: doc Water Pump_T-stat DIY.doc (48.0 KB, 4400 views)
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      09-22-2011, 03:53 PM   #2
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Anyone done this without draining the system completely just to change the thermostat itself or the Engine Coolant Temperature (ECT) sensor?

Car through P0128 code, thermostat malfunction, and needs to be fixed in order to stop Service Engine light from reoccuring. Reference my post here for more details: Service Engine Soon P0128

If so, please provide some details/insight and Part #'s (can't find them anywhere) if you can and any pictures if possible too! TIA.
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      09-23-2011, 01:22 AM   #3
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Quote:
Originally Posted by syl2us View Post
If so, please provide some details/insight and Part #'s (can't find them anywhere) if you can and any pictures if possible too! TIA.
Part number 11537549476 at realoem ($118)
It's under engine->engine cooling (http://www.realoem.com/bmw/showparts...54&hg=11&fg=35)

Coolant does have to be drained to replace thermostat. Also, don't forget the replacement bolts.

Great DIY from Eninty- this one and coolant as well

Last edited by queensfield; 09-23-2011 at 01:30 AM.
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      03-27-2012, 12:09 AM   #4
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works for n54 execpt 1 thing

this thread was very informative. I used it exactly on my 335i. except you need to take the intercooler out to drain radiator. no big deal. 2 torx bolts and 2 quick clips for the piping. thank you for the help
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      04-23-2012, 09:15 AM   #5
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Thanks. Great writeup. Looks like our 330i needs a new pump. Who did you use for parts?
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      04-23-2012, 06:37 PM   #6
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Quote:
Originally Posted by pizzaflyer View Post
Thanks. Great writeup. Looks like our 330i needs a new pump. Who did you use for parts?
Tischer.
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      09-16-2013, 02:12 PM   #7
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I'm at 120K miles, and it seems my water pump is dead... I'll be posting details on the cost, what needs to be replaced, etc.
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      09-19-2013, 05:21 AM   #8
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might have to do this one day,tag for later
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      07-25-2014, 02:42 PM   #9
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If anyone's interesting in how mapped thermostatic systems work, I found this. It's a good primer to show how the various engine load/engine speed/incoming air temp/vehicle speed combinations play into how the ECU pulses the heating element inside our thermostats. These combination values are compared to a stored map, thus explaining the term "mapped thermostat." Enjoy.... http://www.volkspage.net/technik/ssp/ssp/SSP_222.pdf
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      02-21-2017, 10:39 PM   #10
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Thanks to Entity for the DIY. I did the waterpump and thermostat on a 2010 328i LCI auto with 70K miles. It really is a bear - took me over 8 hours (without breaks), with car on stands.

I removed the passenger side wheel well cover and the electric fan. That really helped - the location of the pump and T-stat is so cramped that any extra space for maneuvering was welcome . Unlike most posters, I removed the water pump first, although I had to disconnect the large hose from the radiator to the thermostat in order to get at the infamous 3rd bolt on the water pump which faces the front of the car. I was able to remove the 3rd bolt using a stubby 3/8 ratchet and a universal extension.

I could not figure out how to remove the T-stat before the water pump, because one of the hose clamps on the T-stat was impossible to get at either from topside or underneath without removing the water pump first to gain access. However,when I started putting things back in, I connected two of the hoses on the T-stat first, then installed the water pump, then bolted the T-stat to the pump and finished the hose connections.

A flexible hose clamp driver REALLY helps, because of the awkward location of those hose clamp bolts. The hose clamp bolts seem to be 6mm, so any flexible driver with a 1/4 inch or 6 mm socket works. Another helpful hint is that when re-attaching the hose fittings with the U-shaped spring clips, keep the clips in the closed position, then push the fittings together (after properly orienting them) until you hear a "click." That will ensure a proper seal.

On my old e46, I replaced the water pump, T-stat, upper and lower radiator hoses, AND the expansion tank in much less time (about 3 hrs) than in this e90. Spent a lot of time cursing the new design.
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      02-22-2017, 07:48 PM   #11
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After you do it once, it's easy. The first time I did it, I took my time over 2 days.

Then my car got rear ended and it was a total loss...

I bought a new car that needed a waterpump and thermostat so I removed the freshly installed parts on my totaled car, removed the parts on my new car, and installed the parts I took off of my old car onto my new car.

3x. In less than 1/2 a day. Take that!!!
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