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  #16  
Old 06-09-2008, 05:03 PM
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^^ This would mean that the coolant sesnor only works in conjunction with the a/c system.

So the signal to the aux.fan is broken w/o complete a/c system?
sorry, still working on this one - the FSM sucks for this.

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  #17  
Old 06-09-2008, 05:09 PM
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Quote:
Originally Posted by jt20 View Post
^^ This would mean that the coolant sesnor only works in conjunction with the a/c system.

So the signal to the aux.fan is broken w/o complete a/c system?
sorry, still working on this one - the FSM sucks for this.


I think that's my answer. If the aux fan did anything significant for engine cooling despite a/c, it would be in the engine manual.

and it isn't
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  #18  
Old 06-09-2008, 05:11 PM
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The temp sensor in the cooling system (by the thermostat) prevents the heater from blowing cold air on the passengers.

The electric fan coolant switch exists only on the W116 300SD.
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  #19  
Old 06-09-2008, 05:13 PM
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^^ wasn't it moved to the head?
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  #20  
Old 06-09-2008, 05:15 PM
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^^ wasn't it moved to the head?
No.
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  #21  
Old 06-09-2008, 05:26 PM
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Ok, then I need help with identifying these two sensors on the head.

one behind the dipstick in the picture, and then the other is further on the right side.
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  #22  
Old 06-09-2008, 05:33 PM
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I believe that all 60x powered cars, 201/124/126/140 have the electric fan high-speed controlled by the coolant temperature. Mine all do. The low speed of the same fan(s) is controlled by refrigerant pressure and a ceramic series resistor.
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  #23  
Old 06-09-2008, 05:47 PM
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Originally Posted by jt20 View Post
Ok, then I need help with identifying these two sensors on the head.

one behind the dipstick in the picture, and then the other is further on the right side.
Coolant temp sensor for the EGR computer.
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  #24  
Old 06-09-2008, 06:21 PM
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Quote:
Originally Posted by jt20 View Post
Ok, then I need help with identifying these two sensors on the head.

one behind the dipstick in the picture, and then the other is further on the right side.
One is for your temp gauge, and the other is for the glow plug light I think.
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  #25  
Old 06-09-2008, 06:55 PM
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They both sense water temp. One is variable for the dash:
mbz: 0055421017

other is single temp changeover for egr (as stated)
bosch: 0280130035

Thanks - Now I really feel like I got alot accomplished today.
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  #26  
Old 06-09-2008, 08:22 PM
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Put electric fans on my ford diesel, Maybe got 1/2mpg increase. The only reason I did it on that one is 90% of its miles are on the highway in the winter. Thats about the only reason I would think of doing it.
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  #27  
Old 06-09-2008, 09:57 PM
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Quote:
Originally Posted by ForcedInduction View Post
Not on any W123 or W126 models.
So why do I have a coolant temp sensor?

Specifically, one that supposedly kicks the electric fan up to high speed at around 100 or 105 degrees C?
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  #28  
Old 06-09-2008, 10:04 PM
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So why do I have a coolant temp sensor?

Specifically, one that supposedly kicks the electric fan up to high speed at around 100 or 105 degrees C?
Because you have an 86+ model. This topic is about the OP's 1983 300cd.
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  #29  
Old 06-09-2008, 10:34 PM
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Quote:
Originally Posted by jt20 View Post
They both sense water temp. One is variable for the dash:
mbz: 0055421017

other is single temp changeover for egr (as stated)
bosch: 0280130035

Thanks - Now I really feel like I got alot accomplished today.
So why did my pre-EGR 240D have a wire to hook to each of the senders? Also I thought the EGR for pre-'85 cars was all vacuum controlled.
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  #30  
Old 06-09-2008, 10:42 PM
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Temperature sensor coolant (NTC)
The coolant temperature is obtained by a temperature
sensor (83), which is installed on lefthand side of
cylinder head. The resistance of the temperature
sensor changes in dependence of the coolant temperature

http://www.pauldrayton.com/uploadfiles/merc/Service/W123/w123CD2/Program/Engine/617/14-050.pdf

^^pg 13

I think you are right - but it begins w/ '84

and... vacuum controlled via coolant.

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