know this is an old topic, but i can't seem to find anywhere what the acceptable range is for values off the a/c diagnostics screen on a 1999 clk320

i followed the directions at http://www.continentalimports.com/ser_ic40142.html and got the following error codes
eb1 226 ... in-car temperature sensor
eb1 227 ... outside temperature indicator temp sensor
eb1 241 ... refrigerant fill
eb1 419 ... electromagnetic clutch
eb1 422 ... series interface connection to instrument cluster


also received these values from the a/c pushbutton control
1 in-car temp sensor......................... -40 (that's negative 40!)
2 outside temp indicator temp sensor......... 68
3 heater core temp sensor left............... 73
4 heater core temp sensor right.............. 74
5 evap temp sensor........................... 102
6 ect sensor................................. 70
7 refrigerant pressure in bar................ 5
8 refrigerant temp sensor.................... 69
10 blower control voltage.................... 1.2
24 battery voltage........................... 12.2
40 software status........................... 6
41 hardware status........................... 3
42 ?......................................... 168
43 ?......................................... 8

Just wondering why the in-car temp sensor is registering a negative value!?!
There are plenty of error codes but i'm guessing the best place to start is to replace the evap temp sensor ($42 part)?

a/c's been out for 2 years now so it'll really be something to have it working again! (will also end the 2 years of complaining from my wife for making this car purchase)
had an a/c recharge at a local shop 2 years ago, the ec light came and stayed on thereafter and a/c stopped working ever since.

Thanks all!