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  #1  
Old 07-08-2006, 10:51 PM
Hit Man X's Avatar
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603 aux fan switch?

Anyone know of one that will work in place of the stocker that kicks the fan on sooner? Maybe a 95C/115C?

Seeing how mine doesn't work, why not upgrade?
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  #2  
Old 07-08-2006, 11:57 PM
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There's a few different ones you can use.

Red: 006-545-42-24 (100/110)
Green: 006-545-45-24 (105/115)
Grey: 006-545-61-24 (105/120)
Blue: 006-545-64-24 (105/128)

The first number in parenthesis is the temperature that the aux fan engages at high speed, and the second number is when the AC compresor will cut out.
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  #3  
Old 07-09-2006, 12:19 AM
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GSXR recommends the grey one:
http://www.w124performance.com/images/W124_stuff/Temp_switch_105-12x.jpg
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  #4  
Old 07-09-2006, 12:40 AM
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Ohhhh so there's no low speed for the aux fan when it kicks on?

I'm not too worried about when the comp kicks off as I'd have the A/C off and the heat on high by then, so maybe the red is best?
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'85 300SD 244k
'87 300SDL 251k
'90 300SEL 325k
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Eight others from IH, BMW, GM, Ford, and Volvo.

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  #5  
Old 07-09-2006, 03:05 PM
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Quote:
Originally Posted by Hit Man X
Ohhhh so there's no low speed for the aux fan when it kicks on?

I'm not too worried about when the comp kicks off as I'd have the A/C off and the heat on high by then, so maybe the red is best?
The temp switch on the head that is referred above will start the fan on high speed.

The temp. switch on the dryer will start the fan at low speed.
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  #6  
Old 07-09-2006, 06:39 PM
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What would be causing my aux fan to run constantly? Could that be a switch problem also?
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  #7  
Old 07-09-2006, 08:12 PM
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I changed my coolant the other day, and as I was bleeding it the temp came up much higher then normal. Maybe 105-110ish. But I noticed the aux fan didn't kick on. The switch on my car seems to be original so I think its time for a new one:
Green: 006-545-45-24 (105/115)

Just ordered from Phil 5 minutes ago, I decided on the green because I want the AC compressor to be killed before it gets to 120C.
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  #8  
Old 07-10-2006, 07:08 AM
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Quote:
Originally Posted by Jmana
What would be causing my aux fan to run constantly? Could that be a switch problem also?


My 420 does that, I haven't even gotten that far with it yet... BUT I would assume that's the problem. Until then I just unplugged the fan.
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'85 300SD 244k
'87 300SDL 251k
'90 300SEL 325k
'91 560SEL 189k

Eight others from IH, BMW, GM, Ford, and Volvo.

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  #9  
Old 07-10-2006, 08:56 AM
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Quote:
Originally Posted by Hatterasguy

Just ordered from Phil 5 minutes ago, I decided on the green because I want the AC compressor to be killed before it gets to 120C.
The AC compressor should be killed when it passes 105C.
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  #10  
Old 07-10-2006, 10:38 PM
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Which is the aux fan temp sensor?

I have two sensors on the water outlet connecting to the upper radiator hose. One sensor (single pole) is for the instrument cluster temp gauge. The second sensor (two pole - blue) is next to the first which I thought may control the aux fans. I also have a sensor (lt. green) in the head behind the IP. Which controls the aux fans?
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  #11  
Old 07-11-2006, 09:41 AM
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Quote:
Originally Posted by ched454
I have two sensors on the water outlet connecting to the upper radiator hose. One sensor (single pole) is for the instrument cluster temp gauge. The second sensor (two pole - blue) is next to the first which I thought may control the aux fans. I also have a sensor (lt. green) in the head behind the IP. Which controls the aux fans?
The two pole switch is the likely candidate for the fans. This switch closes one contact to start the fans at 105C. and then it has a second function to shut the a/c compressor down when the temp hits 120C. This would be about 1 before you crack the head on that engine.
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  #12  
Old 07-11-2006, 10:38 AM
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Quote:
Originally Posted by Hit Man X
Anyone know of one that will work in place of the stocker that kicks the fan on sooner? Maybe a 95C/115C?
I like the idea of 95C/105C, but I guess 95C/115C would be better than stock. Any idea what the part number is?

-Jim
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  #13  
Old 07-11-2006, 03:32 PM
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just a thought...

while you are in there and if you want more control, set up a manual override switch on your aux fan so it is there on demand.

I replaced my mechnical fan with twin electric units and have them independedntly wired, fused, and thermostatically controlled as well as indi override switched. In addition I also added a two way hi/lo manual override switch for the aux fan. Now when I need that extra AC boost at Idle, I can switch on the aux fan hi/lo as needed...also useful in a emergency situation when your coolant temp rises or one of your switch fails, manually throw on the fans full blast!

My gang of switches is now fully occupied on the dash, used standard MB switches of the correct style.

Just a thought and good luck
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  #14  
Old 07-11-2006, 04:21 PM
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Quote:
Originally Posted by 87tdwagen
while you are in there and if you want more control, set up a manual override switch on your aux fan so it is there on demand.

I replaced my mechnical fan with twin electric units and have them independedntly wired, fused, and thermostatically controlled as well as indi override switched. In addition I also added a two way hi/lo manual override switch for the aux fan. Now when I need that extra AC boost at Idle, I can switch on the aux fan hi/lo as needed...also useful in a emergency situation when your coolant temp rises or one of your switch fails, manually throw on the fans full blast!

My gang of switches is now fully occupied on the dash, used standard MB switches of the correct style.

Just a thought and good luck
Great unless you have to explain how to use the switches to the wife
I'm having a hard time getting her to hit one button to switch vo on and off!
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  #15  
Old 07-11-2006, 04:22 PM
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Quote:
Originally Posted by 87tdwagen
My gang of switches is now fully occupied on the dash, used standard MB switches of the correct style.
I'm curious on how you did that. Did you have spare switch positions.......or modified the dash???
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