Thread: W124 aux fan issue.....I read tons of posts
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  #14  
Old 08-21-2006, 07:18 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
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Quote:
Originally Posted by CAPT POUNDCAKE! View Post
I DO BELEIEVE THERE ARE TWO SEPARATE CIRCUITS FOR AUX FAN ACTIVATION. (TWO SEPARATE VOLTAGE SOURCES). THE REMOVAL OF THE SENDING UNIT CONNECTOR ACTIVATES HIGH SPEED FAN AS A DEFAULT.THIS IS THE SAME AS OTHER MID 90'S MB'S(i.e C280)....ONCE AGAIN, ID RECOMMEND CHECKING THE FUSED RELAYS IN THE BACK OF THE FUSE BOX.




I hear ya.. but .. the schematic for that chassis shows fuse on LOAD side of relay, whereas the coil side of relay comes from thermistor/sensor and even if defaullt was seperate feed , it would still be on relay coil side..so fan has to have a good fuse to run.. No/Bad fuse = no power feed to fan motor.
Again, check aux fan thermistor ohms/temp specs....
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