Help: Aux fan magna resistor, What is the resistance? - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 07-26-2007, 06:42 PM
1st Gear Member
 
Rfitz25's Avatar
 
Join Date: Apr 2006
Location: San Diego, CA
Posts: 210
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rfitz25 is on a distinguished road
(Thread Starter)
Question Help: Aux fan magna resistor, What is the resistance?

I have the magna style not the Bosch style.

Anyone know what the resistance rating is supposed to be so I can replace it cheap not the $40 replacement?

I read a post once from someone that did this and it worked fine.

I think I can get the right aluminum cased spun resistor part cheap, I just need to know the ohms needed.

I'm going to be replacing the brocken fan with a used one and want to throw in a new risistor while I'm at it.

Summer heat!! San Diego.
Thanks in advance

StarMavin??

Cheers,
Richard Fitz
'87 325is Delphin Metalic

Rfitz25 is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 07-27-2007, 09:02 AM
5th Gear Member
 
Join Date: May 2004
Location: NC
Posts: 1,118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough
I can't seem to find any values on the magna style. The magna and the bosch don't interchange so the bosch values won't help you.
Starmavin is offline  
#3 (permalink) Old 07-30-2007, 12:56 AM
5th Gear Member
 
BMWJNKY's Avatar
 
Join Date: Oct 2003
Location: Elk Grove, CA
Posts: 1,175
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute BMWJNKY has a reputation beyond repute
Send a message via AIM to BMWJNKY Send a message via Yahoo to BMWJNKY
Get one from Pick-n-Pull or don't go out to dinner a few times and just buy a new one.
BMWJNKY is offline  
#4 (permalink) Old 07-31-2007, 04:31 PM
1st Gear Member
 
Rfitz25's Avatar
 
Join Date: Apr 2006
Location: San Diego, CA
Posts: 210
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rfitz25 is on a distinguished road
(Thread Starter)
Are the Bosh and Magna style different ratings or just different wiring connectors?

Whats the Bosch rating anyway if you have it handy?

I believe my existing one is still good I just wanted to put a new resistor in when I replace the fan with a clean used fan, which I havent found yet.

I can get a nice clean aluminum cased finned resistor cheap that should do the job.

Cheers,
Richard Fitz
'87 325is Delphin Metalic

Rfitz25 is offline  
#5 (permalink) Old 07-31-2007, 09:20 PM
5th Gear Member
 
Join Date: May 2004
Location: NC
Posts: 1,118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough
The bosch is around .3 to .5 ohms at 85 watts. The bosch uses a resistor wire where as the magna brand uses a magnetic style ballast resistor. Often times the glue lets the magnets loosen up and fall out of place then it can't transfer the volts. They "can" be fixed but more times than not you'll end up destroying it trying to get it open.

Last edited by Starmavin; 07-31-2007 at 09:22 PM.
Starmavin is offline  
#6 (permalink) Old 08-12-2007, 04:35 PM
1st Gear Member
 
Rfitz25's Avatar
 
Join Date: Apr 2006
Location: San Diego, CA
Posts: 210
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rfitz25 is on a distinguished road
(Thread Starter)
Bump LOL

Questions:
It was payday fri so I'm close to going to the boneyard for a used aux fan.

However:
I spin the main cooling fan when its hot and it still spins freely??? Is is bad??? Looks good no oil leak? Shouldnt the fan clutch kick in when its hot and be hard to spin? (of course I do this without motor running)

Maybe I'll do the clutch at the same time as aux fan but hate to replace good parts?

In the mean time I'll race my virtual BMW M3 GTR on Forza motorsports Live LOL
as well as my BMW V12 LMR and McLaren F1 BMW

Cheers,
Richard Fitz
'87 325is Delphin Metalic


Last edited by Rfitz25; 08-12-2007 at 04:38 PM.
Rfitz25 is offline  
#7 (permalink) Old 08-12-2007, 09:53 PM
5th Gear Member
 
Join Date: May 2004
Location: NC
Posts: 1,118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough
Sounds like the fan clutch is shot.
Starmavin is offline  
#8 (permalink) Old 08-15-2007, 01:46 PM
1st Gear Member
 
Rfitz25's Avatar
 
Join Date: Apr 2006
Location: San Diego, CA
Posts: 210
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rfitz25 is on a distinguished road
(Thread Starter)
Not so sure now.

I did the magazine/newspaper fan clutch test when I got home last night, it was all warmed up, I used a good cardboard paper towel tube (read in some other posts) and tried really hard but I couldnt stop the fan. Seems like the clutch was well engaged.

Maybe it only fails at really high temp like at the last autox.

Found a new aux fan at local inter auto parts $185 but its the bosch ceramic resistor and fan blades arent attached to the outer ring like mine is and the wire conneector is much shorter so I'm not going to buy it? The pic from bavauto is like the one I have? I'll keep searching. LOL
64 54 1 381 395

Cheers,
Richard Fitz
'87 325is Delphin Metalic

Rfitz25 is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 3-Series (E21, E30)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
e39 aux fan temp sensor Xero 5-Series (E12,E28, E34, E39, E60) 0 02-16-2007 12:00 AM
part number for ac and aux fan relays(already did search and called dealer miami325e 3-Series (E36) 12 06-15-2006 08:24 PM
aux fan miami325e 3-Series (E36) 7 06-14-2006 01:20 PM
HELP: Auxiliary fan not working. A/C works intermittently coheed 3-Series (E36) 6 06-01-2006 01:41 AM
waterpump and fan? eclipsevrl 3-Series (E36) 3 09-30-2005 03:18 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome