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Old 07-27-2014, 11:01 PM
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Location: Decatur, Illinois, USA
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Which aux fan temp switch should I use?

I need to replace my Aux fan temp switch in my 1986 w201 190E 2.3-16v.
The OEM factory switch is a 006 545 6124. It is labeled as a 105degree/120degree switch. How does that work? Does it come on at 105 or at 120?
I am considering using a different switch to make it come on sooner. The 006 545 4224 is a 100/110degree switch and the 006 545 4524 is a 105/115degree switch. Would is make sense to use one of these other switches to get the fan to come on sooner that the oem switch does? I have heard of people doing this to get the often very hot 2.3-16v engine a fan blowing on it sooner.
Any advice?

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1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red
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Old 07-28-2014, 03:03 AM
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If you add a resistor (1.1kohm I think) across the prongs, your fans will cut on at 92 I think. Has to be the right resistor though or they may turn on earlier than 92 But if you're running hot you may want to find the actual cause first. If there is no problem and you just want to run the engine cooler I'll post a link to a thread you can check out.
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Old 07-28-2014, 05:09 AM
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I need the forum's input on manual engine cooling
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Old 07-28-2014, 07:52 AM
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Want the fan on sooner

Yes, I don't think I really have any cooling issues and there aren't any over heating problems or failing parts. I just want to see if I can get the fan on sooner to keep the temps down. In traffic the car gets quite hot especially with the a/c running.
Any one sure of the size of the resistor to use across the terminals of the temp probe?
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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red
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  #5  
Old 07-28-2014, 10:50 AM
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Chris,
You might want to take a look at Jim Forgione's great site on Mercedes. While he has articles on C140 maintenance he also offers a resistor for all models. I used one in my '93 CE320
K6JRF Auto Page
Anziani
'95 E420 130K
'97 CL500 150K

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