Aux fan replacement. - Mercedes-Benz Forum

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post #1 of 31 (permalink) Old 05-11-2013, 10:56 AM Thread Starter
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Aux fan replacement.

Hey guys, I have a 1990 300E with the dual electric aux fans. I need to replace them as one is not working, so I think it's not allowing my newly installed ac compressor to work effectively. The ac blows warm arm unless I'm driving plus with the ac on my car runs warm at idle. Can someone supply me with instructions on removing these two fans? Pictures would be great. Thanks!


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post #2 of 31 (permalink) Old 05-11-2013, 01:01 PM
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Use the forum's search feature. The aux fan R&R instructions have been posted multiple times.

Be sure to clean out the condenser & radiator fins using a pressure washer.
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post #3 of 31 (permalink) Old 05-11-2013, 01:45 PM Thread Starter
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Use the forum's search feature. The aux fan R&R instructions have been posted multiple times.

Be sure to clean out the condenser & radiator fins using a pressure washer.
Thanks!


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post #4 of 31 (permalink) Old 05-11-2013, 01:49 PM Thread Starter
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Having a hard time finding it


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post #5 of 31 (permalink) Old 05-11-2013, 01:57 PM
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post #6 of 31 (permalink) Old 05-11-2013, 03:32 PM
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Be sure your aux fan resistor, relays and fuses are all good and working.

At a minimum, replace the resistor and ALL the fuses with the updated copper core type.

Sometimes a bad resistor will result in only 1 fan running even though both fans are functionally OK.
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post #7 of 31 (permalink) Old 05-11-2013, 08:05 PM Thread Starter
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Be sure your aux fan resistor, relays and fuses are all good and working.

At a minimum, replace the resistor and ALL the fuses with the updated copper core type.

Sometimes a bad resistor will result in only 1 fan running even though both fans are functionally OK.
Where might I find the resistor? Price? The fan that's not working is the drivers side. I works for a few moments if I apply pressure to it, but it doesn't spin as fast as the other one. Does that other fan make that much difference in getting the ac cooler?


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post #8 of 31 (permalink) Old 05-11-2013, 10:31 PM
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Resistor is located behind driver side headlight unit.

Replace with BERU replacement unit only, available from autohausaz.com
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post #9 of 31 (permalink) Old 05-12-2013, 02:01 AM
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For your cooling and A/C system to operate as intended, both aux. fans need to be operational. They are two speed fans. Low speed kick on with the engagement of the air conditioner. High speed kick in when your engine temperature hits approx. 105 degrees.
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post #10 of 31 (permalink) Old 05-12-2013, 10:35 AM Thread Starter
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For your cooling and A/C system to operate as intended, both aux. fans need to be operational. They are two speed fans. Low speed kick on with the engagement of the air conditioner. High speed kick in when your engine temperature hits approx. 105 degrees.
Does that second fan make that big of a difference in both ac and engine cooling capacity? When the big engine fan spools up under acceleration, ac has its best performance and engine cools drastically. Plus is this idling too low when the ac is engaged? Normally idling with the ac of is about 750-800 Aux fan replacement.-imageuploadedbyag-free1368380086.277137.jpgAux fan replacement.-imageuploadedbyag-free1368380104.639367.jpg


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