that wasn't it
just replaced the thermistor. split the tube, excised the old one and soldered the new one in. it's still fading in and out - i suspect a bad connection at the harness junction. if only someone could tell me where it is (by the fusebox somewhere?)...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"