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  #1  
Old 09-26-2004, 04:11 AM
greggyc
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electric cooling fans

How can I check the electric cooling fans? I've never had them come on without the air being on. Now that my air has conked out, how can I test them to be sure they are not the culprit? New resistor was installed in April by Stuttgart South in Nashville

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  #2  
Old 09-26-2004, 11:03 AM
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electric cooling fans are for the aircon only when switched on they come on
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  #3  
Old 09-26-2004, 12:08 PM
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The aux fans come on high speed when the coolant temp reaches 105C.. can be tested by removing the connector on the blue 2 wire switch on the thermostat housing. They will come on when that circuit is open.
The a/c uses the low speed fan [ pre-resistor circuit ] and comes on when the high side pressure of the a/c reaches 20 bar.... that can be tested by jumping the high pressure switch at the drier/reciever
Two different circuits using the same fan/fans...
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  #4  
Old 09-26-2004, 12:10 PM
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this depends on if it has a viscous fan
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  #5  
Old 09-26-2004, 12:24 PM
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It does
He has a 201.029 w/103 engine

Also,he already had the preresistor changed out , so that indicates dual fan circuits ...ECT/AC........
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  #6  
Old 09-26-2004, 02:55 PM
greggyc
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I'll check it out

thanks...now, where is the thermostat housing? do you mean the coolant thermostat housing(I know where that is) or something different...sorry, mb's are still quite new to me. VW's and Chevy's I'm used to.
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  #7  
Old 09-27-2004, 09:19 PM
greggyc
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where is it?

I've looked for a blue wire but can't find it...today my coolant reached pretty close to 105c and the fans didn't come on...I need to check them out.
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  #8  
Old 09-27-2004, 09:47 PM
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If no blue switch at thermo housing, then you have a green 3 wire switch , if so, unplug it and jumper to ground the br/gy wire to ground.. that should trigger fans

is not , check fuse "D" -16A..
There were a few changes on the sensors and fans on these models.
..but , NONE of them trigger until 105C, so don't expect fans til then.
[ except for low , a/c fan]
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  #9  
Old 10-02-2004, 03:18 PM
greggyc
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I feel stupid!!!

the only things I can find sticking out of my cylinder head top are a blue sensor with green and brown wires and a green sensor with black/green and pink/green
wires (it's hard to tell if it's black/green or black/yellow and pink/green or pink/yellow)...and a black sensor with one black wire. None with 3 wires. When my a/c was working the fans worked fine...but it's locked up now and I just want to be safe and know they will still come on because they aren't running now without the ac. I'm One of those anal retentive people
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  #10  
Old 10-02-2004, 03:29 PM
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As stated in a prevoius post , if you have a BLUE SENSOR/2 WIRE.. dicsconnect it and see if the fan comes ON

Your reply to my BLUE 2 wire sensor was you could not find a BLUE WIRE .. there is NO blue wire , BLUE is the color of the base of the proper sensor..
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  #11  
Old 10-03-2004, 04:42 AM
greggyc
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next shot

I'll let that be my next shot tomorrow...but it's still not at the thermo housing..it's kind of towards the back of the engine...that's why I couldn't figure it out. My diesel chevy is much easier to find stuff on...
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  #12  
Old 10-03-2004, 09:38 AM
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On the '89 190e-2.6 it should be under the edge of the air-filter box..
So, that is where to do the high fan testing...
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  #13  
Old 10-04-2004, 02:03 AM
greggyc
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didn't come on

I unplugged the 2 wire connector from the blue sensor and the fans did NOT come on...what next?
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  #14  
Old 10-04-2004, 03:11 AM
greggyc
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I also tried jumping the two wire connector...no fans...that way either.
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  #15  
Old 10-04-2004, 11:45 AM
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Did you try Fuse "D" , 16 A as previous post mentions ?
If that is OK , you need to check wire diagram


Last edited by Arthur Dalton; 10-04-2004 at 11:54 AM.
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