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#1
06-27-2014, 12:55 AM
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w210 Aux Fans mysteriously turn themselves on
Went out to the car at midnight, closed the door then the fans started by themselves mysteriously. Had been sitting for 6 hours so it was cold. Speeds varied as I searched for a fuse. Couldn't locate a fuse for them, so I unplugged the battery. They ran for 20 minutes while searching for fuse and then removing the back seat to access the battery. Anyone had theirs start up on their own before? Should I start with the relay? Thanks.
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1999 E300 TD 1999 E300 TD, WVO conversion 2007 Jaguar XJ8 1993 190E 2.3, Limited Edition, 239,000 miles (sold) 1991 300 SL (sold) 1977 MGB 1969 TR6 1980 TR8 joturbe@comcast.net 
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#2
06-27-2014, 09:10 AM
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The aux fans on a 210 are controlled by the "EGS" box which is located in the front left corner of the vehicle.
EPC shows an arrow pointing to the left front corner of the bumper but I suspect it's under the hood behind the left headlight. There are 2 part numbers based on your VIN. So beware if you hit the yards that you get the correct one.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#3
06-27-2014, 10:55 AM
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You can usually turn the aux fans ON/OFF by pressing and holding for 10sec the 2 AUTO buttons on the climate control unit. Also cycle the key a couple of times. There is no fuse for the AUX fans.
http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1997/E300/SYSTEM%20WIRING%20DIAGRAMS/6183.pdf
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CENSORED due to not family friendly words 
Last edited by tjts1; 06-27-2014 at 05:38 PM.
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#4
06-27-2014, 11:59 AM
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JayBob..thought the EGS controlled the Transmission located on passenger side ECU area. What would it have to do with the fans coming on?
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1999 E300 TD 1999 E300 TD, WVO conversion 2007 Jaguar XJ8 1993 190E 2.3, Limited Edition, 239,000 miles (sold) 1991 300 SL (sold) 1977 MGB 1969 TR6 1980 TR8 joturbe@comcast.net
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#5
06-27-2014, 05:28 PM
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water?
I'm thinking the problem is fixed now. I had hit a major puddle of water as there was lots of flash flooding. I'm thinking the Aux Fan controller was soaked as the water was deep. It is mounted low under the headlight, under the bumper area. Now today with fans plugged in, (the wire plug is in the front grill area under a cap where the High Pressure valve for the AC is located) they are not running on. I'm thinking the connections dried out fixing the problem.
tjts, good to know about switching the fans--I tried it and it worked.
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1999 E300 TD 1999 E300 TD, WVO conversion 2007 Jaguar XJ8 1993 190E 2.3, Limited Edition, 239,000 miles (sold) 1991 300 SL (sold) 1977 MGB 1969 TR6 1980 TR8 joturbe@comcast.net
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#6
06-27-2014, 05:35 PM
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the older model W210 has the fan controller somewhere in the fuse box, the later ones have it under the headlamp area.
In my car the single cooling fan has a 40A fuse
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017)
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