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ACC Question 1983 300SD
The fan switch as we know has three buttons, high, low and auto.
When I press the Auto button it does not hold, as in it doesn't click in like the high and low fan buttons will. It will cancel either low or high, whichever function was being used, but not click in. Questions: What is the proper effect of the auto button? Is it supposed to click into place?
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This area is typically used to brag about one's current or former automobiles. |
#2
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The proper effect is to control the fan speed based on air temp at the sensor and temp selected at the wheel.
The Auto button on my car does not "click" either.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#3
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My 1981 wagon only considered those buttons as ' Mild Suggestions from the driver' and felt free to ignore or wait 20 minutes to respond....
I suspect the canceling of the low and high is proper... what it relies on to act I am not sure off hand. Try turning the temperature regulator farther one direction or the other and give it some time to see if it does in fact come on in response to that nudging...
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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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This is normal operation for this button. AUTO means exactly that. The ACC will automatically control the car's temperature based upon the wheel setting and ambient air temperature. It takes awhile for the AUTO setting to kick in (meaning NO button is depressed on the PBU) and the fan to start but it does. The heating and cooling are iffy at best in my car so I almost always have FULL heat, FULL air, or OFF depending upon the season.
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2009 ML320 Bluetec 1985 300CD 1981 300TD Past Mercedes 1979 300TD 1982 300TD 2000 E320 4Matic Wagon 1998 E430 1984 300SD 1980 300SD |
#5
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Quote:
I haven't used the auto feature, mainly because I assumed the auto button was supposed to remain depressed and assumed because it was not that the system was not functional. Great news. Thanks!
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This area is typically used to brag about one's current or former automobiles. |
#6
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Sounds like you need a new "brain" selector bar. I bought one for my SD when it acted-up as you are describing. It was about $115.00, new from MB dealer 13 years ago or so.
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#7
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I really do not trust the auto system..
is there something pulling ambient air from the passenger area across some sensor in order to start it up ?
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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 |
#8
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I'm confused. If your answer describes that my unit is functioning properly then why would I need a new "brain" selector bar.
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This area is typically used to brag about one's current or former automobiles. |
#9
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On the w123, that little vent in the center of the dash (The famous rotted foam tube is connected to) air is pulled across the air temp sensor by the cabin fan. IIRC, air is pulled by the w126, but it's intake is close to the rear view mirror.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#10
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Does the cabin fan run all the time ? Or all the time the car is running ?
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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 |
#11
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Scratch getting a new one then.
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#12
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Thanks, I am just making sure that I'm reading it right. Its been a long week and my brain may be a bit mushy.
Thanks for your input.
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This area is typically used to brag about one's current or former automobiles. |
#13
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I will have to check. Unless i hit the O button, i believe i always have air of some type.
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This area is typically used to brag about one's current or former automobiles. |
#14
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The fan runs when the any button except the off button is pressed. Auto mode is enabled when the center button or the button between the center and off are pressed in.
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#15
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Well, with that information I now trust that ' auto' button... Thanks..
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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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