Nice topic about Cruise Control Amplifier. Also quite often Clutch transistor going bad - CC start hesitate and then quit... If you look at the board from top and 14 pin connector on a left - clutch transitor located by 8001-501 chip on left lower corner it is 40c part....
You may have to modify the way you follow these directions for your W126s, but it's just about the same way to do these repairs in the W126 as they're laid out for the W123.
I did a writeup on this job. This is a true (not a cheapo) R134a conversion that has held and worked nicely in hot&humid Washington, D.C. for two full seasons now. I'm not talking about the conversion - all I am explaining is how to replace the expansion valve (which is the first thing to go after a doubtful conversion) yourself for about 90 bucks in parts in one afternoon. This is a job that was quoted to me at several places at over $1,250 (yes, with the r134a conversion already done, so the quote means the refrigerant for the entire system only cost me $15 at Target...).
Linear Mode
