Auxiliary fan
10-11-2014, 09:19 AM
#1
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E320 4-matic
Auxiliary fan
Need some help determining why my auxiliary fan is not coming on. I determined the motor was bad and replaced it, held both auto buttons on the A/C control and the fan came on after replacement. Now the fan will not come on at all even with both auto buttons held. I applied 12v direct power to the fan and it does spins along with the slave fan.
I know there is a control under the drivers headlight and don't know of any way to test it.
Can anyone help to test or determine which direction I should go? Is there something else holding out the fan from running?
I know there is a control under the drivers headlight and don't know of any way to test it.
Can anyone help to test or determine which direction I should go? Is there something else holding out the fan from running?
10-13-2014, 10:17 AM
#2
Out Of Control!!
There have been many changes as to how the aux fan is controlled---the simplest(first) is to locate the under hood fuse and relay box and confirm that the fan fuse and relay is not faulty!!-----to do that you should have an electrical schematic for the fuse and relay box---you do have that??
10-13-2014, 06:50 PM
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E320 4-matic
I checked the 30amp fuse and it is good. I think there was one other at #41 or 42 and it was also good. I do not have a drawing of the relay box. I am assuming the relay box is right next to the fuse box that has three Phillips screws holding the cover on.
