My 98 C230 has been having A/C issues. Slowly it's gone from having great A/C to where it would only kick the compressor if I started the car with the AC on. Now it will come on, work for about 10 minutes then things get warm.

The compressor kicks in and out before it just stops.

I had a shop check it and they evacuated the system, did a pressure test and recharged and they said it has no leaks or level problems, they believe it's electrical.

I've tested the codes using the Climate Control Module and the following were the DTC codes that showed:

232 - Refrigerant Pressure Sensor
233 - Refrigerant Temperature Sensor
416 - Coolant Circulation Pump
417 - Left Duovalve (Water Valve)
419 - A/C Compressor Electromagnetic Clutch
451 - Diverter Flap
453 - Fresh/Recirculated Air Flap Long Stroke
454 - Fresh/Recirculated Air Flap Short Stroke

I reset all the codes and have run the test a number of times and I only ever get the 416 (Coolant Circulation Pump) code activating. While I may have a pump going out, I don't see that impacting my AC.

I've had the car for almost 2 years and the PO advised that they had just recently had the entire AC system replaced.

I figure I have a sensor that's gone or is going bad, but I'm not getting anything displaying to show that there is a problem.

Can anyone recommend some steps to help identify the problem child? Texas is about to get really warm, so I'd like to get this corrected as soon as possible. I bought this car because I didn't want to replace the AC system on the 300SD (I joke that I bought an AC system and it came wrapped in a Mercedes).

Any help or suggestions would be appreciated.

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1998 W202 C230 - The money pit of late.
1984 W126 300SD (356,800 miles) Gone to the wrenchapart
1984 W123 300D Gone to the wrenchapart
1972 W108 280SE 3.5 (sold but not forgotten)
1986 Buick Grand National 3.8l Turbo (86k miles)
1966 Glassic Model 'A' Replica http://www.glassicannex.org

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