I pulled up my ac codes. I have a 1998 c230.

The a/c codes where:
03 12 9
05 146
06 152
07 8degree9
08 100
10 295
20 000
21 070
22 000
23 000
24 13.8
40 03
41 03
42 18
43 6

I have a problem where my ac compressor cuts off after one minute. It's nice and cold but then cuts off. Restart car same thing, works for just a minute.

I'm pretty sure it is because of the evaporator temp sensor. I think that is the '05 146' reading? My understanding is that that value should be much lower?

Do you think I am correct with replacing the sensor? That 146 value doesn't seem to change much.

I'm wondering if I have enough pressure? I think that's one of the above readings. Or is it just the sensor? I would think 146 is way off.

There's no hissing sound and it blows cold for that minute.

You need a set of gauges to see your low and high pressures. Chances are, your high-side pressure is running way up there and the high-pressure switch is kicking the clutch on the compressor off. This can be caused by lack of air-movement through the condenser in front of the radiator - check to see if your electric fan is kicking on when you engage the A/C. I found this on my '93 190E 2.3 - I forgot I had removed the fuse for the electric fan when I was having alternator issues and the compressor would kick off when stopped at idle. I put gauges on it and found my high-side pressure was running well over 300 psi and would kick the clutch for the compressor out, and re-installing the fuse dropped it down to around 225ps.

Replace your evap temp sensor. It better not be 146 deg there even if it is in deg F.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician