|
I'll wager a bet its the Climate control (push button ) module, there are tiny little relays that carry the full current gong to the blower and the contacts get dirty and fail to carry current, you can burnish them with some sandpaper (600 grit crocus cloth?)
Then there is the well known issue of the solder joints on the connector header on the side where the plugs goes on. With all the W123 cars you have I am surprised you haven't seen this problem b4. Resolder all joints and see if that doesn't fix it.
I have seen both of the above problems, as well as burned traces caused by a short that occurs when the brushes wear down to little nubs (there is a retrofit fuse kit for this). I bought a spare panel just for the purpose of substitution for this kind of problem in my W123's. The dreaded thing was underdesigned from the factory INHO.
Dieseldiehard
1971 220 (gas) 4-spd manual 106441
1979 300TD w/ ’85 turbo engine 295530
1983 300D 243280
1985 300TD 217300
1987 300D 258230
__________________
'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
|