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#1
11-04-2004, 11:56 AM
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Auxiliary Fans running always FULL speed
The auxiliary fans (dual) are operating at full speed as soon as the ignition is turned on my 400e 93 (m119 engine). I've checked the fuse, but not the relay. It is my understanding the "full speed" aux fan condition is normally caused by short or failure in the coolant temperature sensor creating the low resistance state. Since the fans are not operating at "half or low" speed, I'm NOT suspecting the problem is a result of a pressure sensor on the air conditioner.
Has anyone else had a similar issue? Could the "full fan speed" be a result of a failed auxiliary resistor or is a failed fan resistor characterized by other symptoms other than full fan speed? Should I begin by checking the ohms on the coolant temp sensor? Thanks for any help! Russell
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Russell McMahon Tulsa, OK 2001 CLK 320 1992 400se 1993 400e 2000 320ML 
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#2
11-04-2004, 12:11 PM
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Aux fan temp sensor is suspect. Check for OHMS.. also , be aware that it could also be bad connection at the the sensor as if the sensor is out of the circuit, the Module defaults to full fan.
Other possible is relay contacts stuck closed. Aux fan resistor is not in the aux HIGH fan circuit. It is only in low fan circuit[ that is how low fan is accomplished]
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#3
11-04-2004, 12:24 PM
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Arthur, Thanks for the response.
When you make reference to the “Aux fan temp sensor” are you referring to the coolant temp sensor on the engine block?
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Russell McMahon Tulsa, OK 2001 CLK 320 1992 400se 1993 400e 2000 320ML
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#4
11-04-2004, 12:34 PM
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Blue 2 wire , I believe
What chassis?
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#6
11-04-2004, 07:41 PM
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B11/2 is Engine management ECT sensor
It is two sensors in one case ..pins 1/3 and 2/4 should read ohms and they both should have the same values. But... the ECT sensor for the aux high fan should be B10/8... blue base , 2 wire...according to the schematic for 124.034 -1993 400E... The other single wire sensor is for temp Gauge........... Last edited by Arthur Dalton; 11-04-2004 at 10:52 PM.
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#7
11-05-2004, 04:39 PM
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aux fan switch
Check out part # 008-542-32-17 4 prong auxiliary fan switch pretty common failure call phil at partsshop 888 333-4642
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