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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Water Pump Problem?
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      07-12-2019, 12:05 AM   #1
kenlena46
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Water Pump Problem?

Okay so I have a 2011 BMW 535i. Two weeks ago I was driving it when the system notified me to pull over and turn the vehicle off due to it overheating. I live in Arizona and it was 110 out that day and I figured my coolant was running low or my fan wasn't working properly. I then let the car cool down and was able to get it back home by driving very slowly with the A/C off

Once I got home I did some research and figured the water pump had failed because there wasn't any noticeable coolant leaks and the coolant was still full also the fan was working fine. I ended up ordering a new water pump and thermostat. Once those items arrived I changed them out and did the recommended bleeding of the water pump. The water pump started the bleeding process and finished within 15 to 20 minutes. After that I took the vehicle on a road test and noticed the same thing was happening still and the vehicle was starting to overheat again. I then figured the problem was a bad radiator, expansion tank or a temperature sensor, so I ordered all three parts and installed them once they came in. Once the parts were installed I tried to start the bleeding process with the water pump and it would not turn on to start the process. I then topped off the coolant and began to take it on another road test to where it once again started to overheat again.

I thought maybe the fuse for the water pump needed to be replaced but I came to find out that my year vehicle no longer had a stander fuse and BMW replaced it with an Integrated Supply Module. So now I am not sure if the water pump is bad or if the supply module needs to be replaced. I tried a test light on the big red wire coming off of the water pump plug and it is not getting any power. I tested the supply module leads and it is getting power so I'm not sure if that means the module is good and the water pump is just defective. At this point the only part of the cooling system I haven't replaced yet is the electric fan, but that seems to be working properly.

Any help would be much appreciated
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      07-12-2019, 11:45 AM   #2
ziekxq
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When my water pump died on me, I got the car overheat alert as well. The only difference was that the fan would kick in 100 percent and was very loud. My BMW mechanic told me he never seen thermostat go bad on these cars. I have 2011 535i xdrive. Changing the water pump fixed my issue. If the radiator fan is not kicking super high and super loud than it might be something else beside water pump.
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      07-12-2019, 05:55 PM   #3
kenlena46
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Thanks for the your reply! My radiator fan does kick on and it does go into a high speed setting that is very loud. I do believe I received a faulty water pump.
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