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#1
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1982 300D - what is the electric fan in front of radiator for?
I've never seen it go on when I'm working on the car. What is it for, what system is it part of?
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Andrew Montclair, NJ -------------- 1982 300D Turbo 120k Petrol Blue Green |
#2
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They serve 2 purposes:
1: When the coolant temp rises too high they switch on to help cool the radiator back down. 2: When the A/C runs (if your car has it), they cycle on and off to maintain temp/pressure in the condenser |
#3
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Quote:
Many mechanical things are that way.... .that is why they seldom act up when you have a mechanic looking at them..
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#4
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got it, makes sense. thanks guys!
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Andrew Montclair, NJ -------------- 1982 300D Turbo 120k Petrol Blue Green |
#5
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On the diesel 123's, the auxilliary fan has nothing to do with engine coolant temp. It only runs when the temp of the freon in the AC system gets to a certain temp. Which is almost as soon as the compressor kicks on.
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#6
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I think resto is correct, only the AC temp switch screwed onto the side of the filter/drier actuates the electric fan in my 1984 & 85. Of course the switch doesn't pass the fan current directly, but rather turns on a relay that drives the fan. The circuit is that simple, with no controller box. The relay sits on the driver's inner fender under a plastic cover. The other relay there actuates the AC compressor clutch, exc. in 1985 where the Klima box handles that task.
Seems I have seen my radiator fan turn on when the climate button is off, with engine idling on a hot day. If true, perhaps that circuit gets powered from the Accessory position. BTW, many find the radiator fan turns on too late to keep the cabin cool on a hot day. The fan makes a big difference in helping the AC work well. Rollguy designed a re-wiring so the fan turns on with the AC clutch. Downside is the fan would then run on the highway when not needed, though that would help propel the car a little (joke).
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1984 & 1985 CA 300D's 1964 & 65 Mopar's - Valiant, Dart, Newport 1996 & 2002 Chrysler minivans |
#7
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Interesting. On the 126 there is a temp sensor in the coolant for the Aux fan. With the original clogged radiator in my SDL, the Aux fan would run when the temp would rise to the point that the engine fan couldn't keep the temp down.
In normal operation, this shouldn't EVER happen, but if the coolant temp gets to the trip point (105-115˚C depending on the model) the Aux fan does come on. Considering all the other cars from the era had this (even my '83 107 has it), I'd be surprised if the 123 doesn't unless only certain models had it (like the turbo or something). Unless it were running very hot (overheating) you shouldn't ever see the aux fan kick on based on coolant temp. |
#8
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Your SDL is an 86 which has the OM 603 engine. Starting with the 603 they added coolant temperature to the aux fan control scheme. The 616/617 fan was strictly refrigerant pressure controlled.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#9
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Are you sure about that ?
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#10
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You have the paper electrical FSM? Peruse it and you will have your answer.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#11
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Quote:
Do YOU know the answer ?
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#12
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Yes, Jay Bob is correct. What is your answer?
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#13
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The picture on page 83.6-502/2 F4
shows the Temperature switch (6) and identifies it as the auxiliary fan connection.
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#14
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Where is that temp switch located? If you look further, you will find it is on the receiver/dryer.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#15
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Quote:
Do you think that makes my statement false ?
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
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