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-   Diesel Discussion (http://www.peachparts.com/shopforum/diesel-discussion/)
-   -   Electric Fan for Diesel (http://www.peachparts.com/shopforum/diesel-discussion/224539-electric-fan-diesel.html)

jt20 06-09-2008 05:03 PM
^^ 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.

jt20 06-09-2008 05:09 PM
Quote:
Originally Posted by jt20 (Post 1878756)
^^ 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

ForcedInduction 06-09-2008 05:11 PM
1 Attachment(s)
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.

jt20 06-09-2008 05:13 PM
^^ wasn't it moved to the head?

ForcedInduction 06-09-2008 05:15 PM
Quote:
Originally Posted by jt20 (Post 1878770)
^^ wasn't it moved to the head?
No.

jt20 06-09-2008 05:26 PM
1 Attachment(s)
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.

babymog 06-09-2008 05:33 PM
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.

ForcedInduction 06-09-2008 05:47 PM
Quote:
Originally Posted by jt20 (Post 1878787)
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.

bgkast 06-09-2008 06:21 PM
Quote:
Originally Posted by jt20 (Post 1878787)
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.

jt20 06-09-2008 06:55 PM
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.

81300sd 06-09-2008 08:22 PM
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.

bustedbenz 06-09-2008 09:57 PM
Quote:
Originally Posted by ForcedInduction (Post 1878743)
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?

ForcedInduction 06-09-2008 10:04 PM
Quote:
Originally Posted by bustedbenz (Post 1879071)
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.

bgkast 06-09-2008 10:34 PM
Quote:
Originally Posted by jt20 (Post 1878879)
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. :confused:

jt20 06-09-2008 10:42 PM
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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