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F10 / F11 (2011 - 2016)
The sixth generation of the BMW 5 Series Sedan (F10) was produced from 2011 - 2016 with LCI updates arriving in 2014. In the US BMW offered a hatchback 5 Series Gran Truismo (F07) and the rest of the world also go a Station Wagon/Touring version F11.

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Old 12-10-2016, 11:53 PM
Rami.j Rami.j is offline
Registered User
Location: OKC
Join Date: Feb 2015
Posts: 6
Mein Auto: F10
Need Help

Hello Friends,

I need your help to find out what's going on with my car.

Recently I noticed the radiator fan goes high and low when I turn the heater on. that is really weird since the temperature outside is about 34 F. and engine temperature gauge haven't climbed up yet. even when I leave it running it still within normal range. also, this condition only happens when I turn the heater on. but if I turn it off, everything seems to be normal!

I checked the coolant level, and it was within normal, although I toped it to the max. and when I turn the heater on, the air does warm up, so the water pump should be fine, I guess!

I checked it with ISTA D, and I found the attached error codes. I cleared them, haven't came back but the fan still goes crazy when I turn the heater on! one of the codes stat that the water pump was turned off due to blockage, so I thought about a blocked thermostat, but when I cleared it, it did not come back, so I am not really sure.

I appreciate your help.


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Old 12-11-2016, 11:33 PM
BMW technician BMW technician is offline
Officially Welcomed to the 'Fest
Location: Los Angeles
Join Date: Sep 2015
Posts: 314
Mein Auto: I3
BMW tech here,,,,when it said water pump blockage,,,,,it's telling you the water pump is inop,,,,you need to replace the water pump,,,,the fan is going on high because it is on default so it won't overheat,,,,check out my blog page bmwtechnician. com
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Old 12-12-2016, 12:05 AM
Rami.j Rami.j is offline
Registered User
Location: OKC
Join Date: Feb 2015
Posts: 6
Mein Auto: F10
Thanks for replying to me. I have some questions, this happens only when I turn the heater on, it does not happen if I leave the car running or when I turn the AC on.

Also, the error have not appeared back after I cleared it, and it said that it was forced to shut off due to blockage, is it possible that the thermostat is blocked?

what you think?

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Old 01-15-2017, 05:25 PM
mrwhite888 mrwhite888 is offline
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Location: Hong Kong
Join Date: Aug 2016
Posts: 5
Mein Auto: 520i
Try to replace the thermostat. Hope this helps Click image for larger version

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