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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Pictures: Electric water pump + thermostat replace



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      02-02-2010, 04:33 PM   #1
JamesUKE92
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Pictures: Electric water pump + thermostat replace

Just done this earlier today after pump eventually got here from Germany, not too bad a job if you don't mind the odd splash of coolant in your face...

Access to pump is a little tight, and one of the Alu bolts is right up behind the pump, but all is possible.
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      02-02-2010, 04:37 PM   #2
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      02-02-2010, 04:44 PM   #3
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Wwow..nice work althought your ramps would scare the hell out of me.
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      02-02-2010, 04:58 PM   #4
JamesUKE92
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One final treat, here is the sound the pump makes when bleeding the air out... Thanks to ENINTY in this post:

http://www.e90post.com/forums/showthread.php?t=248187

For the instructions to key-up the pump when engine is off...

Here's the sound:

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      02-02-2010, 05:01 PM   #5
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Haha! Actually the ramps are each 2 railway sleepers stacked up, with another piece cut into a wedge, then tacked to the main two to prevent them sliding away... It certainly was scary on the way up, but they are solid as a rock really.
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      02-02-2010, 05:19 PM   #6
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Nice pics! So you have to remove the plastic trays, sway bar and what else to get to the pump/t-stat?

Is the new t-stat housing metal or composite plastic??
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      02-02-2010, 05:28 PM   #7
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Right, you remove main tray, and additional tray that sits up against the rad. Then anti-roll bar bush mounts and let it hang out of the way (without hitting your head on it loads of times like I did). Only other thing was unbolting the power-steering cooling loop mounts, and pushing that pipe out of the way.

Indeed the new stat seems to be plastic rather than Alu, but all fittings / angles are identical to the original part.

I was interested to see that the pump impellor is still plastic like the original... I thought I heard that they went Alu on that.

I'm wondering whether to have a peek in the old pump before I return to BMW for my surcharge back... I'm guessing something electrical failed...
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      02-03-2010, 11:23 AM   #8
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JamesUKE92:

I am curious how to take off the rigid plastic coolant hoses connected to the waterpump/thermostat unit. Undoing the locking metal circlip is easy enough, but I didn't know if one then twisted or just pulled off the plastic hose/connector.
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      02-03-2010, 12:36 PM   #9
JamesUKE92
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Yes, half of the connectors are Jubilee clips, the other half are quick-release type affairs... I should have posted a pic of one of them for reference, but you can practice on the small one going to the coolant header tank (once de-pressurised of course - please don't jet yourself with boiling water). The wire clip pulls up till it clicks then the hose just pulls off. The big one going to stat needed a bit of force to shift though.
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      02-03-2010, 01:28 PM   #10
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Quote:
Originally Posted by JamesUKE92 View Post
Yes, half of the connectors are Jubilee clips, the other half are quick-release type affairs... I should have posted a pic of one of them for reference, but you can practice on the small one going to the coolant header tank (once de-pressurised of course - please don't jet yourself with boiling water). The wire clip pulls up till it clicks then the hose just pulls off. The big one going to stat needed a bit of force to shift though.
Thank you, it was the big one that was kicking my butt.
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      02-05-2010, 08:32 AM   #11
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nice work James...This will come in handy for those who decided to keep their car for a long time. Would you tell us how many parts/unit were replaced? It appears to me that there are 3 units being replaced based on your photos. Obviously, one of the unit is a water pump, the other two units I don't have a clue what they are.
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      02-07-2010, 09:33 AM   #12
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What were the symptoms.... did you get stranded on the road?
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      02-08-2010, 05:06 AM   #13
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txusa03: I replaced the pump, thermostat, and the 3 Aluminium bolts that secure the pump to the engine block, plus coolant naturally. The new thermostat is made of plastic rather than Aluminium - so I guess that is the mysterious 3rd part you mention.

tuned2ride: Symptom was amber overheating warning, closely followed by red overheating alarm. I quickly pulled over and stopped engine. Upon checking under bonnet, radiator + hoses were cold, but small amount of coolant had vented.

I checked interior heating, and that was cold too. Luckily I was only a mile or so from home so waited for about 10 mins with engine off and drove gently for a minute then stopped for 5 - etc till I got home. I wouldn't necessarily recommend doing this - especially in warmer weather / climate. But in my case I luckily never got another warning on my limp home, and no more coolant was vented.

If a significant amount of coolant was allowed to be vented then one could risk causing engine damage.
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      02-09-2010, 11:47 AM   #14
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Great write up!

I just did my thermostat last night, but I'm still over heating.

Water pump is next... Expensive little sucker!!!
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      02-09-2010, 01:12 PM   #15
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Very impressive work!!

I got the red overheating alarm a couple of days and took it to the dealership. They said that I had to replace: Water pump + thermostat + VANOS solenoid.

Currently have ~130,000 miles on the car, so I was out of warranty.

Just got the car back today morning. Total damage: ~$2300
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      02-27-2010, 08:23 AM   #16
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Update: I got INPA recently, and it seems the clever little ECU knew all about the water pump failure. Including what the milage was and pump current, voltage, temp, rpm etc...

But some bright spark at BMW deemed that neither water pump drawing zero current, nor running at zero rpm was worth bothering to light the MIL!!! Well done!

There was even a log of comms loss to pump when I unplugged it... Yet again no MIL!!!
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      04-27-2010, 02:23 PM   #17
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Quote:
Originally Posted by JamesUKE92 View Post
Update: I got INPA recently, and it seems the clever little ECU knew all about the water pump failure. Including what the milage was and pump current, voltage, temp, rpm etc...

But some bright spark at BMW deemed that neither water pump drawing zero current, nor running at zero rpm was worth bothering to light the MIL!!! Well done!

There was even a log of comms loss to pump when I unplugged it... Yet again no MIL!!!
James, what is INPA and MIL? Are you having issues after changing out the pump/stat? TIA.

If you have time, read this http://www.e90post.com/forums/showth...r+pump+failure

This is the reason why I am very interested in your DIY...that day have haunted me for as long as I owned this car (knock on wood)...
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      04-28-2010, 04:34 AM   #18
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Hi txusa, INPA is just BMW's official diagnostics software - similar to the error code displays in your thread - although yours look a bit different.

All I was saying is that I got hold of my own copy of INPA since I replaced the pump, and noticed that all the error codes for the water pump failure were in there - just like for your thread.

My surprise was merely that our cars have a "Check Control" thing that returns the comforting "Check OK" message even when the ECU knows some very specific information about a serious engine fault.

I would have expected some error message / MIL (Malfunction Indication Lamp) beyond the generic "I'm feeling rather hot today".

Luckily my water pump has been fine so far since I replaced it...
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      04-28-2010, 11:40 AM   #19
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Sudden and unanticipated water pump failure without warning is a tradition dating back to the very first BMW's. Don't mess with success!
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      04-28-2010, 11:45 AM   #20
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james,

What was the mileage? I noticed saalim mentioned his went out at ~130,000 miles.

Trying to anticipate when I can expect mine to inop.
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      04-28-2010, 01:53 PM   #21
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mine went out @ 9K miles.
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      07-15-2010, 07:34 AM   #22
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I hate to bump this thread, but I just wanted to give an extra thanks to the OP. I just purchased my 335i with 50K miles on it and the thermostat was bad. So I decided to change the plugs, give it an oil change, delete the CDV and fix the thermostat. Everything else was a piece of cake but this thermostat has been a real PITA, the hoses are hard to get to and a pain to pull off.

After removing the Thermostat I noticed that the plug wires were nearly sheared through and that it possibly wasn't a bad thermostat but just the wires grounding into themselves. So I cut the plug off to re-pin and that went well, other than I forgot which side the colors went to. Luckily this thread had a picture of the plug and wires so I'm out to go solder upside down in sticky coolant. It's funny because I purchased the car so I wouldn't have to work on my project car anymore.
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