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1984 MB 190D
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11 Posts
Discussion Starter #1
My 190D engine Fan does not clutch because of electrical problem. If I ground the wire by the electrical clutch at the fan, it work OK. The elecrical diagram indicate there is a Temperature switch, that should complete the electrical circuit, but I cannot follow the wire on the car to locate this sensor switch. Does anyone have information that can help me to locate and replace the temperature switch?
[?]
 

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87 Euro 190d 2.0 4M
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35 Posts
I'm hoping that by bumping this to the top we'll find out. It's probably in the cylinder head- and the wiring runs from it to the back-side of the "electro- magnetic clutch." I tried to follow the wiring on mine- (an 87 2.0L 190d) but it was too dark to tell where it terminated. I did find out that the temp switch which activates the magnetic fan clutch is called an "engine temp sensor" in one of my manuals.

As an aside- the wiring on mine is pretty crappy and appears to be moist with some nice black oil, which is probably causing the poor connection that is responsibe for my prob!
 

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1984 MB 190D
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11 Posts
Discussion Starter #3
[:)]Thank you, I found it on top center of the engine, near the front; just follow the top rad hose to the engine. I replaced it with MB part $50. cdn. Now it is working perfectly.
 

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2011 GLK,2007 S550,2003 S55,2008 CLK,2009 C300,1996 E300,2005 E320,2002 E3
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1,355 Posts
Should the fan be on at all times?

Fellas:
I just grabbed a 190D yesterday, and noticed on startup the fan did not come on? I lets the car run for a 3 minues and the fan stull did not kick on[:(]
 

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'85 2.3-16 '99 C280 '11 GLK350
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4,804 Posts
The auxillary fan is just that, auxillary and is switched on by the temp sensor monitoring the coolant temperature. If the coolant temperature rises and the fan does not cycle on, then it's a problem with 1) sensor; 2) fan relay; 3) fuse for the fan circuit 4) fan clutch, or all of the above.
 

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2011 GLK,2007 S550,2003 S55,2008 CLK,2009 C300,1996 E300,2005 E320,2002 E3
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1,355 Posts
Shouldnt the main fan come on at all times though(the one under the shroud)
 

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'01 SLK230,'93 190E 2.3, 1971 LS5 Corvette Convertible
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2,225 Posts
4benzes - 5/19/2005 9:02 PM

Shouldnt the main fan come on at all times though(the one under the shroud)
No, it does not come on at all times...only if the coolant temperature rises high enough to cause the temp. sensor to activate the fan clutch.
 
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