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#16
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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. |
#17
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Quote:
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 |
#18
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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. |
#19
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^^ wasn't it moved to the head?
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#20
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#21
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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. |
#22
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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.
__________________
Gone to the dark side - Jeff |
#23
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Coolant temp sensor for the EGR computer.
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#24
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One is for your temp gauge, and the other is for the glow plug light I think.
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine |
#25
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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. |
#26
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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
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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? |
#28
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Because you have an 86+ model. This topic is about the OP's 1983 300cd.
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#29
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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.
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine |
#30
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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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