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Originally Posted by BillGrissom
Thanks. Extremely useful. Like most owners, the climate controls in my 1984 & 85 act erratic. I have a bag of spare TempRegular boxes and swapping usually doesn't help, or just changes the problems. I'll open one and try this. I assume one also has to change the leaky capacitors. What is the best way to remove the conformal coating? Any solvent which makes it easy? Heat?
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Removing the coating is *NOT* recommended. In some cases, it's all that's holding the card together. Your soldering iron will punch right through it for de-soldering and re-soldering. Clean everything afterwards with denatured alcohol or acetone and an old toothbrush. Just how I do it, I've been rebuilding modules and control boards for this era of Mercedes and BMW for over 20 years. My day job is electronics assembly/testing/repair. I speak from experience to save you time and frustration.