thanks, i found that thread. i'm hoping it's a loose / dirty connection. if not, then i have to go looking for a used temp mode module.
i do think it has to do with humidity / temp changes. i have already changed the thermistor and immediately after it was still behaving the same way. it is blank at the moment and i put a 3k load at the connector in the fuse box and it remained blank so i think the cable and probe are not it...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"