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#1
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ACC Question..
Hey everyone,
I did do a search on this one..but all the results seem to be about problems much more severe... I just got this 82' 300SD im working on and when I use the ACC..its extremely slow to action...as far as i can tell all the various functions work..but it just takes 3-5 minutes to actually do supply the demanded function... I'm no expert on this stuff so anyone got any ideas? -Kris
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#2
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Watch the fresh air flap behind the glove compartment (on W123 atleast). I bet that is the slowness.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#3
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well i checked it out..the flap moves at a snails pace...however that doesnt appear to be the only problem..i tested the acc in all the different modes and it would appear the center vents and lower outer vents are stuck open and in cold mode the for all functions except the DEFROST...all modes take atleast 30 seconds to kick in except defrost...when I hit the defrost button...everything kicks in immediately.
So, it would appear that the ACC control itself is the culprit. I am going to remove it and look at the board see if there is anything that can be worked on or resoldered...maybe i'll swap out the other (working) SD's and give that a test..or should i not do that? thanks -Kris
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#4
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OK..so i've removed the ACC and dismantled it..
It would appear that something happend to this poor thing as you can see the circuit pathways on the top board are all bubbled. Even on the side input/output boards they are bubbled too. The pics from the side were burry so Im not going to waste time posting. Here is a pic of the back, it looks ok...
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#5
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Forget about trying to fix those CCU's. You'll be at that game for years. They never quite get to what you need.
A rebuilt unit that's got a three year guarantee is the way to go. What's your time worth? |
#6
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Quote:
How's yours working?
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#7
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good point. im still curious as to why certain pathways got all bubby in the first place..is it somthing in the control device or is it something in the harness..and could it happen to my replacement unit?
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#8
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Don't fully know yet.........the vehicle still sits........waiting for me to get the a/c checked out.
The other two are terrific..........both of them work flawlessly. But, neither is a rebuild.........so........it's just a matter of time.......... |
#9
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Quote:
Well at least you got that knocked out. I swear, some day I'll rebuild the A/C in the 300SD... I've been soaking up all the cold air from my 750iL as of late.
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#10
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I would do a complete vacuum element check. If the flaps are actually moving. But doing it very slowly then a slight leak of a line or an element, could be causing the slow reaction.
Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car |
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