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e39 aux water pump problems

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    Posted: 16-February-2010 at 10:39
Hi guys - having problems with my heater and the garage says its down to the aux water pump. Its a 97 E39 (523). Can anyone tell me where exactly the aux water pump is and what it looks like ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrew Rolland Quote  Post ReplyReply Direct Link To This Post Posted: 16-February-2010 at 12:39

If your car has an aux water pump then this will be fitted below the radiator.

My E39 did not have one.

I thought the aux pumps were only fitted the to M52 TU engined i.e. post 98 models.

If it is a cold heater problem then most likely the fault will be with the thermostat.  If it is an overheating problem then you probably still have the original plastic water pump impeller which may have sheared off.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote voxpop Quote  Post ReplyReply Direct Link To This Post Posted: 16-February-2010 at 13:37
Yeah - I thought I didnt have one, but I took the car to an Indy that specialises in bmws - they seem convinced that its the aux water pump. I was hoping to get an idea of what it looks like and where it is, just to double check that its there.
My aircon does have the REST functionality, which I think suggests that it does have an aux pump - but Im open to correction.

The heater is always cold, thats the problem, but the car engine temp gauge rises to the 12 position and doesnt budge, which suggests that the thermostat is ok.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote jetsetwilly2000 Quote  Post ReplyReply Direct Link To This Post Posted: 16-February-2010 at 16:24
Heater valves?  Common fault...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrew Rolland Quote  Post ReplyReply Direct Link To This Post Posted: 16-February-2010 at 16:24

Punch your last 7 digits of your chassis number in the box next to serial number http://www.realoem.com/bmw/select.do

My E39 had a rest facility, never used it.

If your heater is cold but the temp gauge is normal try giving your heater valves located on the inside of the nearside wing/chassis rail a sharp tap.  They may be sticking. 

Ah, looking on the above website, if your car has a sperate radiator from expansion tank then you may very well have a separate aux pump.  http://www.realoem.com/bmw/showparts.do?model=DD32&mospi d=47539&btnr=11_2638&hg=11&fg=35

If the expansion tank is integral with the radiator I would be suprised if you do have an aux pump.   http://www.realoem.com/bmw/showparts.do?model=DD32&mospi d=47539&btnr=11_2637&hg=11&fg=35

 

 

 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote voxpop Quote  Post ReplyReply Direct Link To This Post Posted: 16-February-2010 at 16:47
They said the heater valves are fine - I left them a new heater valve part to install and they came back to me saying that it wasnt the heater valve but the aux water pump. As mentioned, I thought the aux pump was a 98 onwards feature, which is why I doing a bit of research.

Should I have the car running and then smack it with a hammer .


I threw my vin into the box on realoem and it just selects what I thought 97 523 - not sure what i should be looking at in regards to diagrams, but both the diagrams you (Andrew) linked to should "no parts found" on realoem.

My expansion tank is beside the rad on the right if your looking into the engine.

I was thinking that this pump might be (2) in this diagram ->http://www.realoem.com/bmw/showparts.do?model=DD32& mospid=47539&btnr=64_0676&hg=64&fg=18

Then again - maybe its (12) in this diagram - >http://www.realoem.com/bmw/showparts.do?model=DD32&m ospid=47539&btnr=64_0691&hg=64&fg=18

I have no real idea ??
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Post Options Post Options   Thanks (0) Thanks(0)   Quote voxpop Quote  Post ReplyReply Direct Link To This Post Posted: 17-February-2010 at 10:53
Anyway - gave the valves a bash last night and still blowing cold
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jetsetwilly2000 Quote  Post ReplyReply Direct Link To This Post Posted: 18-February-2010 at 10:41
The pump is 12 in the second link, and maybe it's 2 in the first too, or maybe that's a valve?  Had no idea E39s had this complicated 'latent heat accumulator' thingy.   I'm guessing it was maybe introduced to alleviate heat soak, or else to recover heat to keep in the heater (v useful on diesels I imagine).  Either way is the idea that it runs for a bit when you switch off?  Any E39 owners know about this?

If it was me I'd be getting under the bonnet and tracing hoses - can't be that complicated surely?!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jetsetwilly2000 Quote  Post ReplyReply Direct Link To This Post Posted: 18-February-2010 at 10:41
Just rereading that last post I think I get today's prize for the Most Useless Post 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrew Rolland Quote  Post ReplyReply Direct Link To This Post Posted: 18-February-2010 at 11:11

Ah the latent heat accumulator I think is a different thingie than the "rest" feature mentioned earlier.  If you had the optional extra latent heat accumulator, working on the cooling system becomes a nightmare as the system requires to be filled and bled very differently.

I'm not sure if the pump you mention above is the same pump my link refers to?

I'm failry sure from memory that the Haynes book of parodies shows you a picture of the aux pump under the radiator.  Could be that you have this latent heat accumulator and hence have the aux pump.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote voxpop Quote  Post ReplyReply Direct Link To This Post Posted: 19-February-2010 at 13:24
Yeah, it looks like it does have the latent heat accumulator and there are some extra bleed screws near it ?? Im now thinking of bypassing the aux pump, if possible - any problems doing that other than less hot air at idle ?
The latent heat accumulator seems like a pretty complicated solution to a problem that doesnt exist.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote voxpop Quote  Post ReplyReply Direct Link To This Post Posted: 01-March-2010 at 21:02
Ok so I was doing a bit more research on my heater problem.

My car is a 97 E39. I just checked the part number of the heater valve that the bmw dealer sold me and it comes up as a late 98 part ??

See diagram here - the part is 64128374995. Anyone know what to make of this ??


If I throw in my vin - i get this - which says that the additional water pump (2) is for cars without latent heat accum and the part number for the heater valve is 64128372016 or 64118374994

???


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Post Options Post Options   Thanks (0) Thanks(0)   Quote thepits Quote  Post ReplyReply Direct Link To This Post Posted: 01-March-2010 at 22:34

Originally posted by jetsetwilly2000 jetsetwilly2000 wrote:

Just rereading that last post I think I get the prize for the Most Useless Post 

Oh-No - you've got a l-o-n-g way to go before you get that



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Post Options Post Options   Thanks (0) Thanks(0)   Quote jetsetwilly2000 Quote  Post ReplyReply Direct Link To This Post Posted: 02-March-2010 at 00:46
I'll work at it
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