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  #1  
Old 11-11-2007, 03:38 PM
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Do Away with Aux Fan?

I did a google site search, and came up with page after page of "can I replace my viscous fan with an electric one?"

I want to go the other way... or rather, investigate options for the electric.

Mine has started cooking fuses, occasionally... after a car wash it stayed on constantly and the motor now acts odd. Fan seems locked up when you turn it by hand (sometimes, never constantly of course, that'd be too simple) on occasion, and also the bearings in there make odd headed-south noises when you can spin it by hand.

I've never had the feeling it was doing that much anyway other than making a lot of noise. Has anybody discovered a more durable replacement aftermarket than just throwing another electric MB fan on it?

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  #2  
Old 11-11-2007, 03:39 PM
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Just to clarify, by "more durable" I'm asking if it's either possible to just do away with it completely (very durable) or if anybody knows of a fan that'll last longer. Seems odd to me that it didn't survive running constantly, I only drove short trips during that period before the fuse went, solving the problem.

EDIT:: one more pertinent piece of information is that I have had difficulty turning the fan motor by hand before I let it run constantly after the water got into something (I'm assuming that's what happened, that or a switch went bad. Can diagnose after I put another fan on if I do that). It's been going south for a while. Just wondered if anybody had any better ideas than "just put another mb fan on it."

$200.00 or whatever seems pretty high considering that at least on my car, the viscous fan has always been able to keep up with the heat even in the summer with air, except for when the fan clutch quits.
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1982 240D
1982 300SD


Current:

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  #3  
Old 11-11-2007, 04:25 PM
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Without hesitation i would sack the MB fan and install something generic from JCWitney operated by toggle switch mounted under dash board. Dunno why they bother with over-engineered relays and sensor switches that never work on something as basic as aux cooling fan.
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  #4  
Old 11-11-2007, 04:43 PM
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The actual fan itself is bad? Or just the temp switch? b/c I have an extra temp switch lying around brand new if you need it.
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  #5  
Old 11-11-2007, 05:19 PM
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Michael,
Get in there and do it like a man!
Bosch Aux Fan - New Bearing/Rebuilt - 123 Body
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  #6  
Old 11-11-2007, 06:29 PM
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I don't know about the switch. The actual fan itself seizes up from time to time and makes bearing-ish noises the rest of the time. The temp switch or something else (I haven't tried to diagnose AT ALL) recently started playing up, thus making the fan run constantly. Before I had a chance to investigate, the constant running let it seize up and blow the fuse. I haven't had the inspiration to replace that fuse yet, don't really want it blowing constantly anyway. Won't need it until Summer.

Looking into that rebuild. Looks involved... Let me read for a while
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Past cars:

1986 300SDL
1987 300SDL
1982 240D
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Current:

1987 300SDL
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  #7  
Old 11-11-2007, 06:39 PM
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Thumbs up

Install the late W126 twin aux fans.
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  #8  
Old 11-11-2007, 06:49 PM
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Don't give up your fan living in North Carolina. A couple of things happen with the SDL. When the engine gets hot, the fan is automatically turned on to protect the engine, IN a SDL you don't want the engine over heating and blowing a head gasket. Second, as the AC evaporator heats up it turns the aux fan on to cool both the radiator and evaporator. So you will need it during those hot NC summer days. Also, your engine temp sensors in the SDL will shut off the AC if the engine temp gets to a higher temp. Its trying to save the engine. So I would not get rid of the fan. Replace it with an after market one if you chose, but think lots of work rigging the car to accept it. Rebuild the bearings as posted or just get a replacement. As I have said in the SDL it is engine preservation.
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Last edited by dmorrison; 11-23-2007 at 01:50 PM.
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  #9  
Old 11-11-2007, 06:49 PM
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For what? I'm trying to simplify this thing... that would involve re-wiring things and then the end result would be two devices to burn up instead of just one, wouldn't it?

Sorry...

What's the advantage?
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1982 240D
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Current:

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  #10  
Old 11-12-2007, 05:10 PM
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Quote:
Originally Posted by dmorrison View Post
Replace it with an after market one if you chose, think lots of work rigging the car to accept it.
You've hit the nail of the purpose of this thread squarely on the head. I was trying to find out if anybody had in fact found such a product that went in painlessly that proved more durable than the original.

I'm not deliberately trying to hack things up, just trying to see if there's a reasonable way to do this that's been discovered already.
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1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

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  #11  
Old 11-12-2007, 05:16 PM
Craig
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Messing around with an after-market fan seems like more trouble than it's worth. I would just install the correct part and be done with it for another 300K miles.
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  #12  
Old 11-12-2007, 05:17 PM
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Quote:
Originally Posted by Craig View Post
Messing around with an after-market fan seems like more trouble than it's worth. I would just install the correct part and be done with it for another 300K miles.
You're probably right. I was just checking to see if anybody had found that one magic solution before I bit this particular bullet.

I'll bite. Thanks for all the advice, everybody.
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1986 300SDL
1987 300SDL
1982 240D
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Current:

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  #13  
Old 11-12-2007, 05:27 PM
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Seeing that it's lasted 322k, I'd say you're doing pretty good. Just get a new MB fan and like Craig said, you're set for another 300k. In NC, you're definitely going to need it in the summer.
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  #14  
Old 11-12-2007, 05:27 PM
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For simplicity: Your aux fan can only run if it is told to. The over-pressure switch on the receiver-dryer and/or the water-temp switch on the side of the head tell it to run. Replace the faulty switch and you will rid yourself of the other subsequent problems such as a burned-up fan and fuses.
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  #15  
Old 11-12-2007, 06:13 PM
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Quote:
Originally Posted by bustedbenz View Post
I'll bite. Thanks for all the advice, everybody.
The coolant temp sensor (the one that kicks the aux fan in) is known to go bad (IIRC), and you may want to order a replacement to it so that your nice new fan actually kicks on when you need it to.

I would look at getting the newer dual fan setup.... used parts might work well for this project too.

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