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F10 / F11 (2011 - Current)
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  #1  
Old 09-20-2013, 09:57 AM
Paul Baumeister Paul Baumeister is offline
Paul Wilton
Location: Wilton
 
Join Date: Sep 2013
Posts: 4
Mein Auto: 525i
525i Overheating from oil on water pump connector

I have a 2007 525i that shows overheating when I drive longer than 5 minutes. It will say to drive moderately and then later it says pullover. I do follow the instrutions so that I dont crack my engine or blow a gasket.

I was going to change the thermostat but found out that was not the problem. When I jacked up the car and peered under the engine, I could see that there seemed to be oil dripping on the connection to the water pump. So I cleaned out the connection and blew out the liquid. I let it dry and connected it and that fixed it for 4 weeks.

I took it to a mechanic and he could not see where the oil leak was coming from. So we cleaned the engine of all oil and grime. It worked again for 4 weeks. Now it is overheating again. I checked the water pump and there is oil again on the two bolts below where it connects to the engine. I am attaching both photos.

So when I clean the connectors, it fixes the problem temporarily. Is this a common problem? Is the water pump bad? I cant see where the oil starts to leak from. Above the bolts there is little at all grime.

Anyone have any suggestions?

Water Pump Connector with oil on and in connection


Water Pump: the bottom where the two bolts connect to it show where the oil accumulates.
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  #2  
Old 09-20-2013, 10:45 AM
romeofrosty romeofrosty is offline
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Location: Cape May, NJ
 
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Mein Auto: 2011 BMW 528i
How much oil are you leaking there? Some drops, or is it more than that? Obviously the oil leak needs to be addressed. Looks like the oil is leaking onto some sort of vibration insulator between the water pump and the block and is starting to deteriorate them. Maybe there is some seal on those bolts, or copper washer, etc. that is bad and allowing the oil to leak past the bolts.
If the oil leak is not too bad and you don not want to mess with the water pump, I would suggest sealing the connector somehow. You may want to clean it up again and apply some silicone around where the connector plugs into the pump (after you plug it back in. I hate to suggest it, but mabe some duct tape in a pinch might work. It sounds like the oil is seeping into the electrical connector and causing a circut to complete, fooling the sensor into telling it the water pump has failed. In reality, you are probably not actually overheating, your idiot light is just getting a false signal due to the oil leaking inside the connector. Check your oil temp gauge when this happens. If it looks in the normal range, you are likely not overheating.
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  #3  
Old 09-20-2013, 10:49 AM
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Needsdecaf Needsdecaf is offline
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You should post this in the correct forum. They should be able to help you better:

http://www.bimmerfest.com/forums/forumdisplay.php?f=104

As it is, BMW's are known for having poor cooling systems. Water pumps, radiator end tanks, etc. should be paid attention to. Those guys should have more info.

Good luck!
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Old 09-20-2013, 10:49 AM
romeofrosty romeofrosty is offline
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You could also cut a strip of rubber from an old inner tube and drape it around the conector. go longer so it covers the entire connector and several inches of the wire going to the connector, then zip tie the piece of inner tube in place.
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Old 09-20-2013, 11:19 AM
Paul Baumeister Paul Baumeister is offline
Paul Wilton
Location: Wilton
 
Join Date: Sep 2013
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Mein Auto: 525i
Thanks. I just posted it there. I like the idea of sealing the connector. I was starting to think of something like this, but not of duct tape. LOL. It probably would work though.
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