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Old 08-29-2004, 11:06 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
Dropping resitor is around there somewhere .
This is what you are looking for :
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1A70KFNW8&year=1987&make=MB&model=300-E-002&category=G&part=Aux.+Fan+Resistor
It's main funtion is to reduce the fan speed for the /ac circuit. They series it into the fan circuit with the a/c aux fan relay to get the low speed.
But the reason I want you to look there [ after checking the proper fuse] is cuz they also use it as a connection terminal for the main line to the fan. It is quite common to find these connections burnt to the point of no longer conducting power.
If the relay is clicking and the fan is still not turning, I doubt you have a sensor problem. You have a fan motor power problem.
The sensor test for that circuit is to ground the bn/gy wire at the 3 way sensor. But this only clicks the relay in. The load side of the relay is where you want to be checking components [ ie .-fuse D and dropping resistor connection]

Last edited by Arthur Dalton; 08-29-2004 at 11:54 PM.
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