Aux electrical fan and A/A don't work. - BMW M5 Forum and M6 Forums
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post #1 of 17 Old 17th May 2015, 04:22 PM Thread Starter
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Aux electrical fan and A/A don't work.

Hi, everybody! My name is Rafa; I am from Spain, I'm 20 years old and this is my first message here. Sadly for a problem with my m5. I hope that you will can apologies for my poor English.

Anyway, thanks for made this forum possible with all of your support!


Well, the problem Is about the auxiliary electrical engine fan and the A/A. When the electrical fan doesn't work, the A/A neither works. Up to today, when the electrical fan doesn't start to work when the car was warm (not overheated, always in the middles of both clocks) I unplug and plug it again from the connector and it starts to spin. When it started to spin, the A/A worked perfect but not before so I want to know what could be happen and if the car has some relay that make the A/A and the electrical fan work together.

However, today the fan failded again and i couldn't mede it work unpluged, and pluged and again, the A/A doesn't work. (really the air compresor starts to work but a few seconds later it stop)
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post #2 of 17 Old 17th May 2015, 04:44 PM Thread Starter
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My mobile corrector made my day. A/A is in Spanish. I want say A/C in English.

Sorry about that.

Thanks.
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post #3 of 17 Old 17th May 2015, 10:49 PM
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I figured A/A was in fact A/C. And if it is hot out the A/C will turn off from too much pressure. The fan pushes air through the A/C condenser which is what cools the A/C refrigerant. You need to have your A/C refrigerant levels checked, you may not have enough by what you are reporting.
For your fan
https://www.m5board.com/vbulletin/e39...lp-please.html
In my thread you will find links to other threads, read them all but the one started by SleeperE39 is very good.

The bottom line is you will likely need a new fan, the ones on the M5 are not repairable. Don't get fooled into buying a 4 wire fan it must be a 3 wire fan. The part number is in the other threads.
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post #4 of 17 Old 17th May 2015, 11:04 PM Thread Starter
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Quote:
Originally Posted by Sailor24 View Post
I figured A/A was in fact A/C. And if it is hot out the A/C will turn off from too much pressure. The fan pushes air through the A/C condenser which is what cools the A/C refrigerant. You need to have your A/C refrigerant levels checked, you may not have enough by what you are reporting.
For your fan
https://www.m5board.com/vbulletin/e39...lp-please.html
In my thread you will find links to other threads, read them all but the one started by SleeperE39 is very good.

The bottom line is you will likely need a new fan, the ones on the M5 are not repairable. Don't get fooled into buying a 4 wire fan it must be a 3 wire fan. The part number is in the other threads.
So, all the problem is the fan as I can see.

I think my A/C levels are perfect because when the fan works, it make the cockpit a freezer.

Anyway, I'm reading your link but, could be the reley the problem? Is a little bit strange that when you unplug and plug it again, it sometimes works.

I tested the voltages in the connector and it gives -12/-14 volts (car off/car on) It is correct?
I don't know why with red with red and black with black cables it gave me a reverse (negative) polarity.


Thank you very much!!
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post #5 of 17 Old 17th May 2015, 11:59 PM
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There are three wires and no rely. The two fat wires are ground and power. Black is + and brown is -. The small wire, yellow/red, is a signal from the DME which tells the fan what speed to run at.
Not all speeds will be screwed up. Likely part of the board inside the fan is damaged but some maybe good. That is where the pulse comes from. Mine also pulsed and sometimes would come on, at least when I first bought my car.

As you can see the power can go to the motor from different points. You could see if the pics were better. In the bottom pic just inside the windings are terminals. By sending power through different terminals you get different speeds.
This is why the fuse 75 blows, because the high speed might still work, but without the fan spinning the power demand is too high.
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post #6 of 17 Old 18th May 2015, 12:34 AM Thread Starter
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Ok. There was the reverse polarity problem.
Can I test my fan connecting a battery directly to the black and brown wires?

If with this it doesn't work, is for sure the electrical engine?

Here in Spain I saw replacement engines. Why did you say that the fan couldn't be repaired? If I buy a new engine and I put it where the old was, what is the problem?

Thanks again
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post #7 of 17 Old 18th May 2015, 12:39 AM Thread Starter
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@Sailor24, did you say that the M5 e39 hasn't a reley for the fan?

I saw on the internet photos about a green one for the fan.
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post #8 of 17 Old 18th May 2015, 03:05 AM
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That is from a 5XXi car the M5 got the upgraded E38 system. So you need a direct replacement for a M5 or E38 the other E39 fans won't work. They have a resistor pack and a relay and 4 wires.
To test the fan you can hook up 12v to the black and brown wires, then you need to be able to feed the yellow wire a pulsed voltage. Just test the yellow wire for v with the car running. If you get volts there then you can be sure the fan is toast.
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post #9 of 17 Old 18th May 2015, 03:07 AM
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It is not the motor that fails it is the board that burns. Those motors you see are for other E39s not the M5 which is a E38 fan.
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post #10 of 17 Old 18th May 2015, 04:17 AM
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Quote:
Originally Posted by Sailor24 View Post
That is from a 5XXi car the M5 got the upgraded E38 system. So you need a direct replacement for a M5 or E38 the other E39 fans won't work. They have a resistor pack and a relay and 4 wires.
From what I have found and verified with realoem all e39 5 series cars use the same part number pusher fan.

64546921395

Pusher fan

From:
03/01/2005
To:
-
Weight:
4.110 kg
Price:
$374.55
Supersedes:

64546921946
(11/05/2001 — 05/24/2005), Exchangeable retrospectively
64546919057
(05/31/2001 — 10/17/2001), Exchangeable retrospectively
64506908030
(11/22/1999 — 06/26/2001), Exchangeable retrospectively
64548380781
(05/01/1998 — 11/24/1999), nonexchangeable retrospectively
64548380780
(05/01/1998 — ), Exchangeable retrospectively
64548370993
(09/01/1995 — 06/09/1998), Exchangeable retrospectively
64548371362
(09/01/1995 — 02/01/1996)

Part 64546921395 was found on the following E39 vehicles:

///M - The most powerful & expensive letter in the alphabet

1 of 123 ANTHRAZIT METALLIC (397) / WALK NAPPA/SCHWARZ (M1SW)
Tuned by BMW Motorsports 4/2001, Bone Stock at 185,000 Miles. 355.78 WHP / 345.33 WTQ
2 facts you might not know: Ducks cannot fly and they nest in trees.
Updates:
BM53 Radio / Gen-13 ULF / OEM Sirius / MK-IV Navigation / Aux input / Intravee II / KCA-410c / KCA-420i / 5th Gen i-Pod Nano / CHA-S634 / Umnitza VXX Angel Eyes / F10 ///M5 Shift Knob /
Schmiedmann Shadow Chrome Grills / Rear Fog Lights
DIY: Retro-Fit Auxiliary Audio Input Harness /// DIY: E39 - BM53 & (BMW) Sirius Radio Retrofit /// DIY: E39 - Replacement of the Left and Right Firewall Covers
For Sale:
BMW Style 5 17" 2 Piece Wheels And Tires
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