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  #1  
Old 05-03-2008, 01:15 PM
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1994 E320 Aux fans

Can someone tell me where the sensor is that turns these fans on? They will run even when the car is cold. I am assuming it is a sensor that is bad!! Any help?

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  #2  
Old 05-03-2008, 02:53 PM
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There are two sensors..which speed are they staying ON ????
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Old 05-04-2008, 10:17 AM
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Quote:
Originally Posted by Arthur Dalton View Post
There are two sensors..which speed are they staying ON ????

High speed all the time.
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  #4  
Old 05-04-2008, 10:29 AM
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The engine temp sensor has probably got a bad connection. Could be bad but the problem is often just the connection, wiggle it, unplug and replug it.
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  #5  
Old 05-04-2008, 11:06 AM
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As SB states, a a poor connection at that sensor will default the high fan to RUN.....
That sensor on that chassis it the blue, 2 wire one at the thermostat housing.
You can also test the circuit by unplugging that connector and bridging the 2 wires with a 1K ohm resistor...that will put the fan off if the circuit is OK..if not, then the suspect is a sticking high fan relay..that is under the panel [ 6 screws] behind the fuse box..the Green relay..
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Old 05-04-2008, 11:40 PM
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OK I bridged the two wires @ 1k ohm resistance and the fans turned off. I checked the sending unit that the wires connect to and found when the sending unit is cold the circut is open when it's hot the same. Could this be a bad sending unit? I checked the sending unit with the wires off.
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  #7  
Old 05-05-2008, 11:04 AM
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Bad/Open sensor... The sensor is never open as it is a thermistor, so it always has a R value, temp dependent. If the ACC sees an open sensor, it defaults to full fan for engine overheat safety protection... [ your current condition]

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42D20NK27E&year=1994&make=MB&model=E-320-001&category=R&part=A%2FC+ACC+Temp+Sensor
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Last edited by Arthur Dalton; 05-05-2008 at 03:14 PM.
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  #8  
Old 05-05-2008, 09:17 PM
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Thank You, Thank You, Thank You, I found a broken wire just inside the wiring harness. Works like a champ. Next on the fix it list. Any suggestions why my outdoor temperature gauge doesn't work. One day I looked at it and the numbers were gone.
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  #9  
Old 05-05-2008, 09:22 PM
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That chassis is infamous for bad engine wire harness..keep an eye on it..they fall apart.

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