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  #1  
Old 04-17-2008, 11:39 PM
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1999 E300D aux fan operation

Hi guys, hoping someone with same car can answer a few questions, car tends to climb in temperature when in traffic 95-100 use to be always 80- 85, yes ive read this is normal but something is causing this change in mine which is not normal! second aux fan was changed out last yr and noticed one fan on drivers side sucks air in passenger side blows out is that normal,read somewear here on forum they both should suck in? third part the aux fan used to stay on after i shut car off for anywhere 15 to 30 seconds not anymore i noticed, and yes when I hold down auto for 10 seconds fan roars. does it sound like a bad module or fan motor going, when i turn motored side both sides rotate, when I turn opposite side it wont turn motored side seems belt slips a bit, does anybody have a wiring diagram for electrical so I can begin to trace this ?

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Old 04-18-2008, 01:53 AM
compress ignite's Avatar
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Aux fans

No that is not normal.
Both Auxiliary Electric Fans should push air rearwards
[Negative Wind,or as you so quaintly put it,Suck]
One of the Aux fans spinning the wrong way ,would itself account for the
higher temperature you're experiencing.

I do not have access to your wiring diagram...But one of the U.S.East Coast
Technicians (Professionals) will hopefully spot this post in the Morning.


Go Here: (Free,no charge)

http://www.detali.ru/cat/oem_mb0.asp?TP=1

Find your chassis (by number) "click" on it and you're off and running.

When you see SA go down further on the list until you see BM
(There's never anything usable on the SA lists that I can find)

This is a Russian (Mercedes)Electronic Parts Catalog maintained by the
Mercedes Benz Club of Russia.

Diagram underneath is a teaser of the RU EPC

Good luck!
Attached Thumbnails
1999 E300D aux fan operation-screenhunter_02-apr.-18-00.45.gif   1999 E300D aux fan operation-screenhunter_03-apr.-18-01.13.jpg  
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Last edited by compress ignite; 04-18-2008 at 02:15 AM.
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  #3  
Old 04-18-2008, 05:17 AM
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Clarify your statement about the two fans...do you mean they turn in opposite directions???
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  #4  
Old 04-18-2008, 08:46 AM
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sorry nhdoc, if I wasnt clear , drivers side suck's air in thru grill and push to rad, passenger side pushes out thru grill !
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  #5  
Old 04-18-2008, 09:23 AM
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I can't imagine how this is possible since they're linked by a belt... Even if it was installed backward, it would still pull air through all the same... (runs off to look at fans... )
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  #6  
Old 04-18-2008, 10:45 AM
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Quote:
Originally Posted by 99E300d View Post
sorry nhdoc, if I wasnt clear , drivers side suck's air in thru grill and push to rad, passenger side pushes out thru grill !
What I meant was do both fans turn the same direction (ie clockwise or counter clockwise) or do they turn in opposite directions???

If they turn the same direction then the only thing I can think of is you have the wrong driver fan in there and it has the blades oriented backwards.

If they turn in opposite directions then the belt could be installed incorrectly though I think it is not possible to do this, if it were "criss-crossed" it would result in the driver fan turning one way and the follower fan turning in the opposite direction.
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Old 04-18-2008, 11:43 AM
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It is impossible to install the belt so that the blades turn in opposite directions.

I highly suspect that the auxiliary fan assembly in the car is not OEM. I made the mistake of using an aftermarket assembly with two motors in my '96 and paid the price. Fortunately, I only had to pay the price of another fan and not a head or engine.

You might think that if you apply 12V power to the fan and it comes on that it then must work in the circuit. You would be wrong. The electrical signature of the fan motor is critical. Don't use anything but the OEM motor here, or you will also regret it.
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Old 04-18-2008, 12:07 PM
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I replaced mine last year and like others found they were wired wrong. Evidently sometime in 1996/97 there was a running change that made the connections reversed. All I had to do was to pull apart the plug, reverse the wires and VOILA, they were turning correctly.
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Old 04-18-2008, 12:10 PM
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They both should push air through the fan. Check the electric fan plug. You'll have to remove the shroud in the front. The fans plug into a wire see if you can flip the plug over.
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  #10  
Old 04-18-2008, 12:22 PM
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Check your fan clutch too...

Quote:
Originally Posted by 99E300d View Post
Hi guys, hoping someone with same car can answer a few questions, car tends to climb in temperature when in traffic 95-100 use to be always 80- 85, yes ive read this is normal but something is causing this change in mine which is not normal!
... because I live in Atlanta and during the Summer, in traffic, without the aux fans engaged, I get one needle-width above 80 on the gauge.

To check it, idle the motor and while you're watching the main fan, have someone else turn the car off. The fan should stop rotating in one to two seconds. When mine went bad and lost its fluid, it would coast for over five.
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Old 04-18-2008, 02:20 PM
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There is a better way to check the fan than idling the motor. With the key in position 2, press and hold both AUTO buttons for >10 seconds to put the system in fan test mode. This should start the auxiliary fan at full speed. Turning the key to position 0 or holding both AUTO buttons for another >10 seconds cancels the test.
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  #12  
Old 04-18-2008, 04:05 PM
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well one problem is solved,the belt was slipping on the passenger side ,belt was too streched, plus idiot installed it backwards or better upside down , the way to check if there is enough resistance hold the motor side to stop rotation you shouldnt be able to turn opposite side, what was happening to mine was motor side turned normally oppopsite side turned but not fast enough, so air was blowing out passenger side instead of sucking!
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Old 04-18-2008, 04:09 PM
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I've read here of one occasion where the belt came off of the pulleys and ended up damaging the condenser, so ensure that it is in good shape. The belt itself is not expensive.

Ensure that the fan starts properly a few times using the test procedure above. Certain motor faults will cause it to be intermittent.
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  #14  
Old 04-18-2008, 04:42 PM
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Quote:
Originally Posted by 99E300d View Post
well one problem is solved,the belt was slipping on the passenger side ,belt was too streched, plus idiot installed it backwards or better upside down , the way to check if there is enough resistance hold the motor side to stop rotation you shouldnt be able to turn opposite side, what was happening to mine was motor side turned normally oppopsite side turned but not fast enough, so air was blowing out passenger side instead of sucking!
Lucky it is an easy fix...the belt is cheap and you can pull the assembly out and apart in about 15 minutes.
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  #15  
Old 04-18-2008, 05:15 PM
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aux fan works when ac is on (low) , can turn high on by holding auto 10 seconds, have my suspicion high speed sensor is bad does anyone know where it is to test it?

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