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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 03-21-2011, 04:49 PM
gospeedracer431 gospeedracer431 is offline
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Mein Auto: 1997 528I
how many heater hoses do we have?

just like the title.


hope someone can help!

thanks!
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  #2  
Old 03-21-2011, 05:55 PM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by gospeedracer431 View Post
just like the title.
It's a good question ... I think it depends on the vehicle ... so I'm not sure ... I don't think we narrowed it down for all E39s here ... yet ...
- Complete cooling system overhaul recommended parts list (1)

It would be nice to narrow it down for all the E39s.

AFAIK:
- Everyone has an upper and lower large heater hose ...
- Everyone has a small expansion tank overflow hose ...
- Some people have one, others two medium hoses coming out of the expansion tank (mine has two, for example) ...
- Everyone has a set of hoses going into the heater core
- The automatic transmissions have hoses that the manuals don't have ...
- The V8 has a cooler contraption on the drivers side that the I6 doesn't have ...
- And, some cars (my 2002 525i, for example) have the auxiliary electrical pump hoses ...

What's that equal for each E39? Dunno.

Others who know better can help.

In post #105 of this thread are the hose diagrams for my 2002 I6:
- Pictorial look at typical E39 cooling system failure modes (1)







Last edited by bluebee; 03-21-2011 at 05:57 PM.
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  #3  
Old 03-21-2011, 06:14 PM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
Not counting the two medium-sized hoses for the automatic transmission, nor the two hoses for the air conditioning cooling, nor the two hoses for the power steering system cooling, I just calculated my 2002 525i (M54B25 engine) has eight (8) heater hoses (carrying coolant) as shown below:

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  #4  
Old 03-21-2011, 06:20 PM
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bluebee bluebee is offline
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Looking up the heater core in realoem, to see if there are any unaccounted for hoses in my 2002 525i ... I get thoroughly confused by the plethora of additional hoses that show up!

While the 'triple hose' seems to be aluminum, there appear to be an additional seven (7) cooling system rubber hoses associated with the 'heater core' in my 2002 E39 automatic with automatic air conditioning.

Hoses #1, #4, #5, #11, #12, #13, & #14 below 'appear' to be associated with the heater core.

That would make a total of 8 + 7 = 15 rubber cooling system hoses in the BMW 2002 525i automatic (assuming no duplicate counts).

Is this count correct?

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Last edited by bluebee; 03-21-2011 at 06:49 PM.
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  #5  
Old 03-21-2011, 06:22 PM
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rexgo rexgo is offline
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Quote:
Originally Posted by gospeedracer431 View Post
just like the title.
hope someone can help!
thanks!
Good title!!

'97 528 auto info:
Mine didn't have an IIRC the aux. water pump
Here's the 1-hose expansion tank pic:
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  #6  
Old 03-21-2011, 07:16 PM
cn90 cn90 is offline
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Mein Auto: 1998 528i 5-sp 140K+
For 1997 528i:

1. Hose from bottom of Reservoir as rexgo mentioned above.
This hose is very long and it feeds directly into the T-pipe under the Intake Manifold.

2. Hose from the back of the engine: use a mirror and you will see it.

3. A few more hoses under Intake Manifold. You can see them here:

http://www.bimmerfest.com/forums/sho...d.php?t=379225
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  #7  
Old 03-22-2011, 08:38 PM
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DHoang DHoang is offline
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Quote:
Originally Posted by rexgo View Post
Good title!!

'97 528 auto info:
Mine didn't have an IIRC the aux. water pump
You should have an aux. water pump if your car has that "REST" button on the center console. (REST=Residual heat mode)

There is a small electric pump that is located under the twin heater control valves (just off the drivers side strut tower. It function is to circulate heated coolant to the cabin heater core so heat can continue to radiate inside the cabin and warm occupants for times when the car is parked and engine is turned off.
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  #8  
Old 03-23-2011, 04:04 PM
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rexgo rexgo is offline
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Mein Auto: 97 528i
Quote:
Originally Posted by DHoang View Post
You should have an aux. water pump if your car has that "REST" button on the center console. (REST=Residual heat mode)

There is a small electric pump that is located under the twin heater control valves (just off the drivers side strut tower. It function is to circulate heated coolant to the cabin heater core so heat can continue to radiate inside the cabin and warm occupants for times when the car is parked and engine is turned off.
OK - good to know. I do have Rest but I don't have the aux. pump as shown here. Since I don't have 2 heater hoses to the exp. tank.



I'm guessing my 97 auto is this one:
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  #9  
Old 03-26-2011, 05:32 AM
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gtxragtop gtxragtop is offline
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The answer is..... too many Lot's of $$$ to replace them all that are clearly shown in this thread.
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Ever wonder why 5 series electrical issues are common and complicated.. Spend time here and you will understand why. http://www.bmw-planet.com/diagrams/r...9new/index.htm
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  #10  
Old 03-26-2011, 01:10 PM
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bluebee bluebee is offline
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Here is a pic of my auxiliary water pump on my 2002 525i.

As was noted, in this case, there are TWO hoses coming out of the bottom of the expansion tank, one of which goes to the auxiliary water pump which is on the bottom corner of the radiator on the driver side.

Note: Please ignore the text; I'm re-using my picture from my alternator thread.
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