I have a 1999 e300td. From time to time the thing decides to blow hot from the two side vents when the AC is on. The two center vents work fine. Also the two center vents are noticably colder than the side vents. I've found the duovent discsussions and will clean that out next. I checked the codes in the climate control and I got some errors:

1 - 85
2 - 136 (way too hot, the thing had been idling for a bit in 95 temp)
3 - 58 (These are celcius I assume? Way too low otherwise)
4 - 57 - ditto
5 - 55
6 - E (This is the one I thing is busted - what/where is an ECT sensor?)
7 - 17
8 - 132

The erro codes are
b1231
b1234

I think these both mean something is out of bounds no?

Any ideas as to what to do?

thx

Andy