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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #26  
Old 10-03-2010, 08:33 PM
starrock starrock is offline
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wow, really?
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  #27  
Old 09-03-2011, 04:57 PM
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bluebee bluebee is offline
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For the cross-linked record, today, JimLev provided nice aux fan test info:
- E39 (1997 - 2003) > Aux Fan Help

Quote:
Originally Posted by JimLev View Post
The fan is controlled by the dual temp switch on the side of the radiator and the HVAC system.
Stage 1 is low speed from the HVAC panel or the 91 deg switch on the radiator and relay K21.
Stage 2 is controlled by the AC high pressure switch and relay K22.
Stage 3 (high) is controlled by the 104 C deg switch on the side of the radiator and relay K201, which gets power from fuse F75 (50 amp) behind the glove box. F20 and F105 powers K201.

You said the fan comes on when you turn the AC on so Stage 1 (low) is working which means the 2 resistors are good.
Pull the connector off the dual temp switch and jump it to see if you can get.
Jumping pins 1 to 2 should make it run at high speed and pins 1 to 3 for low speed.
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  #28  
Old 08-03-2012, 08:57 PM
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bluebee bluebee is offline
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For the crosslinked record, QSilver7 posted some nice aux fan information over here today:
-> E39 (1997 - 2003) > please explain!!!

Quote:
Originally Posted by QSilver7 View Post
It depends on which engine you have...in your case...it's the M52TU...


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  #29  
Old 11-18-2012, 10:24 PM
akillies akillies is offline
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I'm having a problem with my aux fan too. My aux turns on and goes off but when it kicks on it makes a very loud noise and sounds like it is straining and the car doesn't over heat. Does anyone have any idea what it could be or what I should do???
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  #30  
Old 11-20-2012, 09:00 AM
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Dking078 Dking078 is offline
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Quote:
Originally Posted by akillies View Post
I'm having a problem with my aux fan too. My aux turns on and goes off but when it kicks on it makes a very loud noise and sounds like it is straining and the car doesn't over heat. Does anyone have any idea what it could be or what I should do???
Mine did that just before it died, mine would turn on, but would stay on the highest fan speed setting. Sounds ridiculously loud right? The cheapest OEM fan i've found is from ecstuning, or just get a used one for cheap.
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Last edited by Dking078; 11-20-2012 at 09:01 AM.
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  #31  
Old 11-20-2012, 02:56 PM
akillies akillies is offline
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Ok, can I replace the motor itself to maybe save some money??
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  #32  
Old 04-15-2013, 04:05 AM
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For the crosslinked record, JimLev offers good advice here for discerning aux fan types:
Quote:
Originally Posted by JimLev View Post
Did your fan motor look like this with these color wires coming out of it?
If so, you have a PWM fan.
The older fans are 3 speed that only have 2 wires ans use relays and resistors to switch speeds.
The resistors are mounted to the fan frame.
See also:
- DIY for how to replace the auxiliary fan (1) (2) (3) & how to test the cooling system auxiliary electrical fan (1) (2) & the infamous fuse 75 (1) & the aux fan relay (1) & an exploding aux fan noise situation (1)
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  #33  
Old 08-27-2013, 02:37 AM
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For the crosslinked record, a screenshot from the Bentley on the aux fan operation is here today:
Quote:
Originally Posted by Burning2nd View Post
Me7.2


See also:
- How to test the cooling system auxiliary electrical aux fan (1) (2) (3) (4)
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  #34  
Old 09-17-2013, 09:10 PM
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bluebee bluebee is offline
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For the record, this is good information added recently:

Quote:
Originally Posted by JimLev View Post
If the temp gauge gets up to 3/4'ers the fan should be on high speed! Which is stage 3. There are no resistors in the circuit for high speed.
You could have blown fuses, bad relays, or the aux fan motor itself could be bad.
You could also have bad resistors or a bad temp switch in the side of the radiator, best to have someone trouble shoot and find out what parts are bad unless you just want to throw parts at it.
Here's the circuit for the 3 speeds. Ignore the notes, they were from helping another person.



See also:
> E39 (1997 - 2003) > E39 Auxiliary Fan DIY write up-With Pics.
- DIY for how to replace the auxiliary fan (1) (2) (3) & how to test the cooling system auxiliary electrical fan (1) (2) & the infamous fuse 75 (1) & the aux fan relay (1) & an exploding aux fan noise situation (1)
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Last edited by bluebee; 08-22-2014 at 06:54 PM.
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  #35  
Old 05-06-2015, 08:50 PM
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bluebee bluebee is offline
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There is a good aux fan discussion today over here:
> E39 (1997 - 2003) > Over heating

See also:
- How to test the cooling system auxiliary electrical fan (1) & a DIY how to replace the aux fan (1) & where is the auxiliary fan fuse F75 (1) & where is the aux fan relay (1) & an exploding aux fan noise situation (1) & what is the o-ring size for the coolant temperature aux fan thermoswitch (1)
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  #36  
Old 07-21-2015, 07:17 AM
emack23 emack23 is offline
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Does the Aux fan make your car over heat
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  #37  
Old 07-21-2015, 07:27 AM
Jicafold Jicafold is offline
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Heck no. It keeps your car from overheating. It's a fan. Although I'm not so sure how accurate that statement is either. It mostly helps the AC condenser. My fan didn't work for a year until I replaced the fuse, but I was never stuck in a traffic jam in the summer either.

Last edited by Jicafold; 07-21-2015 at 07:29 AM.
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  #38  
Old 07-21-2015, 08:39 AM
emack23 emack23 is offline
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My car over heated I towed it to my mechanic after a couple days he called and said my aux fan needed to be replaced because it wasn't pushing hot air out while my AC was on and he said the coolant was boiling in the radiator and that's what caused my hose to blow off as well. The hose to the thermostat housing blew off
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  #39  
Old 07-21-2015, 10:54 AM
emack23 emack23 is offline
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My car over heated on the highway so I pulled over immediately. Opened the hood and saw that the bottom hose of the thermostat housing came off. I towed it back to my house called my mechanic he told me that there was air in the system. I took the steps to get the air out. I turned the car on and let it idle the needle went to the middle then went a tad bit over the middle and went back. It did this a couple times. Then it started to go over to the HOT area really fast I turned off the car then I see steam coming out. I opened the hood and saw that the hose blew off again. I tow it the next day to my mechanic he did a pressure test and everything was fine. He let the car cool off for the day and the next day called me and told me that the AUX fan wasn't working and this is what caused it to over heat. Mind you, while I was letting it idle I had the heater on and it was bleeping hot air then I turned the AC on. I'm thinking that's why it over heated and blew the hose off again???? Pls let me know what everyone thinks! Thank you
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  #40  
Old 07-21-2015, 11:25 AM
Dio///M Dio///M is online now
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As far as the Aux fan is concerned it's very easy for a mechanic to determine if it's working properly or not, I had overheating issues a few months ago on my E39 and it turned out to be a tiny leack /side crack on the radiator. Water was being running off. A couple of months later when it got hot the Aux fan ceased after working unexpected for a couple of weeks in a row...New fan and that was the end of that although to be fair it was a 15 year old original fan and summers in Cyprus are 35 -41 Celsius for days in a row.
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  #41  
Old 07-21-2015, 11:29 AM
Dio///M Dio///M is online now
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...sometimes some overlook simple but important things as well like for example using bmw grade coolant mixture... It makes a difference as Bmw's are very specific in the quality of parts used
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  #42  
Old 07-21-2015, 02:54 PM
emack23 emack23 is offline
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Can I start using the BMW coolant if I have a different one in there now?
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  #43  
Old 07-21-2015, 08:36 PM
Dio///M Dio///M is online now
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Yes, but at some point have it drained from the system and refill with the oem coolant, it prevents scaling and better cooling.
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