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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 12-12-2012, 08:46 PM
Dilligaf-IA Dilligaf-IA is offline
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Location: Iowa
 
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Mein Auto: '02 525i/5
Bosch water pump = Junk

I replaced the entire cooling system back in May of this year. Drove the car daily since then, went on a couple good trips over the summer, and then I started having issues with it overheating last week. This was after winding it out through the gears one day, but nothing too radical, not like I redlined it or anything. The car started to overheat and I shut it down right away. After that I could drive it around for about 10 minutes or so and then it would heat up.

I pulled the Bosch water pump out today and the plastic impeller was broken and no longer turning with the shaft. It was still on the shaft at least, but no longer working. Now to see about getting my money back out of that pump. They have a 12 month warranty.

I just ordered the Hepu pump with the metal impeller. No more bosch pumps for me.


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  #2  
Old 12-12-2012, 08:55 PM
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bkgreene39 bkgreene39 is offline
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Mein Auto: 1998 BMW 528i
I have the Hepu one in a box, have yet to install it. I have been having miserable luck with new parts lately. Expansion tank from dealer leaked 2 months after install, put my old one back thats older then dust and still works. How did you know it was the water pump?
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  #3  
Old 12-12-2012, 09:06 PM
Dilligaf-IA Dilligaf-IA is offline
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Mein Auto: '02 525i/5
It was a combination of troubleshooting and reading. It would overheat on the highway so I didn't think it was fan clutch related. It would warm up to temp and put heat out into the cabin, and then still be putting heat out when it began overheating so I didn't think it was the thermostat although it wasn't ruled out yet. Reading the forums including this post here, I saw other people having similar issues after installing a Bosch pump. I figured it was as good a place as any to start so I took it apart. Glad to see it was the pump and not something like a head gasket or something. I really don't have time to tear into anything like that.
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  #4  
Old 12-13-2012, 02:01 AM
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fullthrottle540 fullthrottle540 is offline
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Mein Auto: E39
the only thing bosch is good at is dishwashers and marketing, thats about it
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  #5  
Old 12-13-2012, 08:39 AM
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doru doru is offline
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Stewart = peace of mind.
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  #6  
Old 12-13-2012, 08:55 AM
240sxguy 240sxguy is offline
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Quote:
Originally Posted by fullthrottle540 View Post
the only thing bosch is good at is dishwashers and marketing, thats about it
Hey! I love my Bosch Jigsaw!
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  #7  
Old 12-13-2012, 09:42 AM
cn90 cn90 is offline
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Mein Auto: 1998 528i 5-sp 140K+
Bosch is good for spark plugs, electronics etc.

The WP business, the HEPU in my E39 is now 6 years/50K old (I installed it in May 2006) and runs perfect.
The Volvo people use HEPU a lot, zero problems.
I highly recommend HEPU. This is why I told people in this forum to stick to HEPU (made in Germany).

Any time you see Plastic Impeller, stay away!

Last edited by cn90; 12-13-2012 at 09:44 AM.
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  #8  
Old 12-13-2012, 03:57 PM
cn90 cn90 is offline
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OK,

I admit that plastic is a useful material. In fact, it is used throughout the car in tons of places.
But the WP Impeller is simply the wrong place to install plastic: wrong, wrong, and wrong.
Sometimes this plastic thingy causes $4000 damage (overheated, blown head gasket).
I am amazed it is still mfg'd this way!
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  #9  
Old 12-13-2012, 04:11 PM
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bluebee bluebee is offline
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The OP should add his insight to this thread:
- What brand of waterpump to buy (1)
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #10  
Old 12-16-2012, 07:13 AM
col7122 col7122 is offline
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Is this a thermostat prob or more sinister

I am a new owner of a BMW x5
I too have experienced the no heat in car, I was out the other day and thermometer flew into red after only driving 25 mins
I stopped turned off engine started up again and all was ok
My mechanic has said it's defo the thermostat....however on going in the engine discovered under the rocker cover cap was White milky residue under cap.....not used any extra water and dipstick oil is clear.....I called the garage I bought from and he fully assured me it is a common fault on these engines E53 3litrei and he says that there is a conversion for the rocker cover breather pipe, and said no way was it the head gasket!!!!!!!! And also he said that problem only seems to happen on cars under 100k mines only done 73k
I am new to BMW so can't say either way.....as normally these indicators as already suggested are head gasket....I do have this car under warranty so he knows if it went pear shaped!!!!!what would happen
Hope this helps!!!!! With any similar faults / answers
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  #11  
Old 12-16-2012, 07:40 AM
FLE39 FLE39 is offline
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I went with the HEPU metal impeller myself.
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  #12  
Old 12-16-2012, 08:10 AM
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champaign777 champaign777 is offline
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Hepa, Bosch why not go by OE for this critical item ?
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