Aux fan and clutch fan - Mercedes-Benz Forum
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post #1 of 30 (permalink) Old 05-20-2013, 06:51 PM Thread Starter
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Aux fan and clutch fan

Is the clutch fan actuated by the 100 degree fan switch on the engine? Im trying to test the clutch fan and am only getting response from the aux fan.

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Last edited by Darryl Elkins; 05-20-2013 at 09:21 PM. Reason: more information
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post #2 of 30 (permalink) Old 05-20-2013, 09:30 PM
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It is on my '87 2.3. At 100C clutch fan and low speed e-fans come on, at 110C clutch fan and high speed e-fans come on.


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post #3 of 30 (permalink) Old 05-21-2013, 05:07 AM Thread Starter
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There has to be a second switch if there is something happening at 100 and something else happening at 110. The switch that I was checking is either on or off there isn't a second setting. Where is the other switch?
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post #4 of 30 (permalink) Old 05-21-2013, 04:01 PM
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I don't know if you have a 2.3 or a 2.6.

On my 91 2.3 there are 3 temp sensors on the top front. One goes to the CIS, another to the electric fan, and the last to the mechanical fan. I don't remember which is which but it should be easy enough to trace the wires.
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post #5 of 30 (permalink) Old 05-21-2013, 04:04 PM
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My '84 has a sensor switch on the water pump cover that activates the electric fan.

There is another one up near the oil fill hole that controls the fan clutch. When I got it, my car was wired to run the clutch fan all the time, and it got really loud on the highway.

On my car, the sensor to the right with the red color on it controls the fan clutch. The newer versions of our cars are similar, but the temperature switch might be different.
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post #6 of 30 (permalink) Old 05-21-2013, 05:09 PM
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Quote:
Originally Posted by Darryl Elkins View Post
There has to be a second switch if there is something happening at 100 and something else happening at 110. The switch that I was checking is either on or off there isn't a second setting. Where is the other switch?
My vehicle has 1 switch with 3 connections, one 2-pole and one 1-pole. It looks like this: http://www.autohausaz.com/secure/Par...0065454224.jpg

There are several temperature sensors that serve other purposes, but that's the fan switch on mine.


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post #7 of 30 (permalink) Old 05-21-2013, 09:25 PM
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Quote:
Originally Posted by Nfsjunkie91 View Post
My vehicle has 1 switch with 3 connections, one 2-pole and one 1-pole. It looks like this: http://www.autohausaz.com/secure/Par...0065454224.jpg

There are several temperature sensors that serve other purposes, but that's the fan switch on mine.
same temp switch as the 16v


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post #8 of 30 (permalink) Old 05-25-2013, 02:15 PM Thread Starter
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Here is a pic of what I am working with but from a different angle. However I just realized the photo is up side down.
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post #9 of 30 (permalink) Old 05-29-2013, 08:27 PM Thread Starter
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The third sensor and connector do not look like the others posted here. Is the connector with the larger black connector the one? If so how does the cable come off? I hope to make sure the clutch fan works before I take on a 7000 mile trip.
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post #10 of 30 (permalink) Old 05-29-2013, 08:41 PM
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Originally Posted by Darryl Elkins View Post
The third sensor and connector do not look like the others posted here. Is the connector with the larger black connector the one? If so how does the cable come off? I hope to make sure the clutch fan works before I take on a 7000 mile trip.
The third one in your case is the computer control. Leave it alone.
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