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Nev 01-06-2013 05:36 AM

Blower fan not working x5 e53
Blower fan just stopped working. Have checked all the fuses and all or ok. Also checked the pollen filter also clear. Changed the FSU with one bought fron OEM supplier and still no joy. The control unit seems to function and shows fan speed and temperature but no blower fan working. Do you have any further ideas ??? Thanks Nev from the frozen North!

Zulu95 01-06-2013 11:20 AM

If you are sure the FSR is working (New ones have failed.) then it must be the blower motor. That involved dash removal. Do a search on xoutpost as I remember somebody did a DIY on the removal/replacement. Figure on taking at least one day for the whole job if not two.

Nev 01-06-2013 12:02 PM

Thanks Zulu love the hat, hate the sound of the job!

Originally Posted by Zulu95 (Post 7293808)
If you are sure the FSR is working (New ones have failed.) then it must be the blower motor. That involved dash removal. Do a search on xoutpost as I remember somebody did a DIY on the removal/replacement. Figure on taking at least one day for the whole job if not two.

Will probably see if I can get some power to the fan motor via the FSU connector just to see if it powers up, also probably buy a brand new FSU from the BMW dealership. Any chance it can be the Automatic Climate Controle unit ???

All suggestions greatly appreciated !

Zulu95 01-06-2013 03:31 PM

There is a chance it is the head unit. Again, try a search over on xoutpost for the HVAC head unit as I think there are a few threads on troubleshooting and replacement. I like the power the blower via the FSR connector idea. The blower is a pain to get at directly.

Nev 01-08-2013 12:51 PM

Sorted !
Thanks for your help. I did put power back up the hedhog connections multi plug and the fan motor kicked in straight away. Finally pinpointed that there was no variable voltage reading from the head unit at the multyplug that connects to the hedhog. This is the very fine wire. Trimmed a little of the wire insulation to check the multipin connection and guess what ~ variable voltage output. Wha Hoo !
The problem was solved by tracing the bad connection. Glad I did not have to strip the fan out. The hedghog was also working fine.:):)

Zulu95 01-08-2013 01:06 PM

Good news! It is nice to win one the odd time.

Nev 01-19-2013 12:36 PM

Just when I thought I had it fixed !
When my dear wife was driving out the gate last week she turned the fan speed down in the car and guess what ! the fan motor stopped completely again. Changed the hedghog and checked all the wiring. seems my last fox was just a bit of luck. The fan works if I supply power directly to it so that is a blessing. Sounds like the control unit. The unit lights up and shows all displays but no fan or change in fan speed. Any idea where one can get a good second hand or reconditioned control unit in the UK:thumbdwn: for the climate control ??

Zulu95 01-19-2013 04:35 PM

Until you can find/fix the head unit can you Heath Robinson a temporary repair? I see things are a little white in parts over there.


Nev 01-20-2013 03:06 AM

Temp repair
Yes just a bit chilly ~ have used the power supply cable to the fan and connected via a 5 amp toggle switch. so can turn the fan on for use in short bursts ~ just need to remember to switch it of when leaving the car.

jamesfrew 03-11-2013 11:38 PM

Hey Guys,
I run an '03 X5 and have had a similar issue. My mate is a BMW technician and advised that there is a 'resistor' that can fault in the air-conditioning control panel (apparently easily missed by the inexperienced technicians). According to him it is a simple fix costing $5 for the 'resistor', however, BMW practice is to change the entire control panel. It may be worth doing a dealership diagnostic to make sure you are not throwing good money after bad by changing what does not need to be changed.

In the icy UK and no fan? You have my pity. At least you can rug up to keep warm, try South Australia in 38 degree heat with no fan. Argggg!!!

Its a pity my bro' is in the NT or he would have a 'home job' to do.

Nev 03-12-2013 02:28 AM

Found the fault
Thanks for the reply. I finally tracked the fault down to dirty terminals in the hedhog connector multi pin socket. After checking all the other components I thought this was worth a try. I purchased some electrical terminal cleaner fro Halfords at a massive cost of 4.99 sprayed it on and let it dry. Plugged it onto the hedgehog and it worked. Magic !!!What a waste of time and effort checking hedhogs, control units and making up a tempory wiring harness to bypass the problem. Dirty terminals was all it was. Has been working fine now for 3 weeks thank goodnes as it is -8%c this morning. Good luck.;)

liurad 03-04-2014 12:49 AM

Blower dead. Replaced FSU and still dead. Finally reached the blower wheel/blades with a stick and freed the seized wheel/blades and blower came back the life. The wheel is located inside the housing of the FSU.

e53kiwi 05-16-2015 10:14 PM

E53 Blower now working
X5 2002 - purchased 2 weeks ago and didn't even try the air conditioning so a little annoyed the seller didn't point it out.
Just got the e53 blower working 15 minutes ago. Thanks to all who helped by posting advice. Some thoughts if I had to do another one.
Right hand drive so FSU is next to driver's pedals. Plastic under tray by pedals needs to be removed and long carpeted strip on side of centre consol. The main plastic tray under the steering wheel does not need to be removed.
1: Replaced FSU - no difference. 2: Tried connecting pins on FSU cable. #1 (lower right on line of 3) to #5 (top right of the 2 top ones. And #2 to #4 - blower motor instantly on full so not the blower. Pulled out radio and then air con control panel which pops out when pushed from behind. A Bluetooth hands-free kit had been installed and jammed in there. A jiggle of the wires and everything worked. Never discovered which wire was loose. Lesson - try the cable bypass (1-5 and 2-4) first to see if the blower works - then try power from air con unit to cable as you adjust fan speed and then FSU. I would have saved $80 for a new FSU if I'd done it logically. Thanks to all who gave advice:)

ledge 01-02-2016 01:22 PM

Final stage unit replacement X5 E53 UK rh drive 2005
Hello this is my first post so excuse the amateur format.
I had the same problem fan not working AC/heater (digital) ramping up and down on demand scale so I fitted a replacement FSU and guess what still nothing so I checked the advice posted on various BMW communities and found the Bluebee post HOW TO BUILD A TEST JIG TO TEST FSU OPERATION ON THE TEST BENCH. This proved invaluable as it shows the connection duties on the FSU connector block. Forum advice on how to allow the fan to run by connecting wire shorts across the connector terminals did not work on my car so I connected terminal 2 (fused 12v power supply) to terminal 4 (motor +) after first testing the supply with a voltmeter to verify fuse was ok. Then I connected terminal 3 (motor -) to terminal 5 (ground). Ignition was on and the fan ran at full speed, jackpot what a relief the fan is ok. Next I switched ignition off removed the shorts and connected a voltmeter from terminal 1 (AC control 2v - 7.8v) to terminal 5 (ground). I had already turned the demand on the digital control panel to minimum so ignition on and around two volts indicated and as I increased demand the volts increased proportionally. Again great the AC/heater control unit was ok. So after reading about bad connection issues regarding the FSU connector block I cleaned the terminals with an aerosol contact cleaner and allowed it to dry then I carefully bent the pin terminals on the FSU around 1mm from vertical with a flat bladed screwdriver this increased the contact between the FSU pins and the connector block terminals. Admittedly this made the FSU connector block harder to connect and I had to carefully tap it on with a flat drift and a hammer tap, it clicked into position and the fan ran perfectly via the AC/heater control unit. So a broken FSU and a poor connection to the replacement FSU unit were the root cause of my issue. PS I checked both units against the Bluebee resistance check figures for both the old stlye FSU and the new version and found that my results were different so I could not verify if the new unit was broken or not. The old unit had a dead pin with no resistance at all so appeared to be genuinely broken. I hope this helps any UK owners with the same problem and a quick check of Blubee's excellent post shows a clear illustration of both the FSU pin and connector block layout. Cheers Ledge.:thumbup: PPS the FSU is in the drivers side footwell on UK cars and advice on getting to it is available on various forums.

karlaw 02-15-2016 02:24 PM

I have heard there is some kind of a trick to do after replacing new resistor. Something about pulling a fuse out, then trying something, then replace fuse, etc. Like a computer reset ?

ledge 02-16-2016 04:30 AM

Reset after replacing hedgehog resistor
Hello I did not have to pull fuses or reset using INPA it was fine once decent connection made at connector and resistor.:)

karlaw 02-16-2016 10:55 AM

What is INPA ? When replacing heater control unit, does anything have to be reprogrammed ?

ledge 02-17-2016 05:35 AM

Hello, no INPA is the BMW software programme used to reset fault codes I used it to reset the heater
fault codes nothing required reprogramming in my case.

BMWx5e85 09-11-2016 02:45 PM

My air blower motor all of a sudden stopped working.

Car: BMW x5 e53 2003

I have tried to connect the air blower motor directly to my car battery and it was spinning then, but when connected back to the installation the motor is completly silent - doesn't work at all.

Hence in my opinion it could be either a blower resistor, or the final stage unit, or climate control deck.

How can I simply check which party is faulty?

BMWx5e85 09-27-2016 03:56 PM

I have change the FSR and everything works now.

Thank you for your expertise, experience and wise advice!

luisddavila 11-13-2016 12:02 PM

I replaced the A/C fan and the FSU and the A/C still takes a while to blow cold air.. any ideas of why this still happen??

Fifty150hs 11-13-2016 08:19 PM


Originally Posted by luisddavila (Post 9930645)
I replaced the A/C fan and the FSU and the A/C still takes a while to blow cold air.. any ideas of why this still happen??

Have you checked Freon level?

luisddavila 11-14-2016 05:51 AM

That will be my next step, thanks I will let you know

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