Where do I start when the ACC will not do anything at all? No fan, no nothing. I've searched all the DIY guides but they all address issues with systems that at least funtion enough to show symptoms of problems. EVery once in a long while I get the blower to go, but no air of any temp comes out anywhere, just hear the blower going. Thanks.

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1969 220D "Berta" RIP
1982 300D turbo 250K

First, check all eletrical connections and fuses. Also check the aux water pump. When that goes, it usually takes the ACC/CCU with it. Also resoldering the CCU seems to help some people. My is still working for the time being. I did add a 1 amp fuse to the Aux water pump circuit to protect the CCU.

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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.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D