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  #1  
Old 06-30-2012, 10:32 PM
mach0415's Avatar
Diesel Weasel
 
Join Date: Mar 2010
Location: Lawndale, NC
Posts: 648
CCU Repaired!

For weeks now, I have been living with Christine, the gremlin that lived in my CCU on my 85 SD. It has been in the 100s here in NC and seemed to have quit working all together on my wife as she was driving. The AC compressor would cycle, but no blower motor. About a mile from the house, it started working...and then not. Go figure.

My troubleshooting found no power to the blower motor and also no power coming out of the CCU to the regulator. So, out came the CCU and with a slight twist and wiggle of the unit caused the blower to come on - that is until the circuit heated up some or got jiggled again, and then it cut off. I removed it and found the classic solder and circuit board components issues these things are plagued with. The relays on the board had loose solder joints, so I simply re-soldered them, thanks to several of threads started and completed by you all.

Christine has been exorcised, the CCU is clear, and mama and I are riding in R12-supplied cold air. If shes happy, I am happy.

Thanks Again!

P.S. If I turn off the AC setting at idle, or I shut the car off and restart it, the AC compressor clutch will not engage until I hit 2000-3000 rpms. Any light shed on that?
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Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi
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  #2  
Old 07-01-2012, 12:03 AM
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Sev Sev is offline
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your welcome
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i know Jim Smith. i don't actually know him, but I know of him
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  #3  
Old 07-01-2012, 07:51 AM
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busy
 
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,895
Nothing like a wife without an air conditioned car.
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  #4  
Old 07-01-2012, 10:30 AM
RML RML is offline
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Join Date: Jun 2006
Location: Southwest PA
Posts: 1,012
I gotta check my solder joints. Been meaning to do that.
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85 300D 71K Anthracite Grey (Rutherford) 0-60 in 13 seconds
84 300D 331K Black (Rufus) 0-60 in 14 seconds (adjusted the ALDA)
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 17K
98 Ford Taurus 62K (Gertie - Was Grandma's - drove it to church and shopping - really)
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60
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  #5  
Old 07-01-2012, 10:42 AM
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ROLLGUY
 
Join Date: Oct 2007
Posts: 5,558
I am wondering if that is the problem with my CD? If I go over a bump, the blower goes off and then back on again. Also, sometimes the blower will not come on after driving the car for a while, and starting it up again. When the blower will not come on, I roll down the window. Then all of a sudden, the blower comes on. Could that be the infamous solder joint problem in the CCU?
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  #6  
Old 07-01-2012, 11:35 AM
Registered User
 
Join Date: Jan 2002
Posts: 18,353
Could also be worn brushes inthe blower. Had that problem in the 84SD.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #7  
Old 07-02-2012, 01:47 AM
mach0415's Avatar
Diesel Weasel
 
Join Date: Mar 2010
Location: Lawndale, NC
Posts: 648
yeah i also need to look at the blower, but the solder joints were glaringly obvious upon inspection. So far, shes still kicking. Yet another repair, not replace.
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Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi
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