2002 c230 a/c problems. EC Rest light will not go out. Help - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 06-17-2017, 10:01 AM Thread Starter
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2002 c230 a/c problems. EC Rest light will not go out. Help

Help in getting a/c to come on needed!

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post #2 of 8 (permalink) Old 06-17-2017, 12:14 PM
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post #3 of 8 (permalink) Old 06-17-2017, 07:16 PM
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This means that the system cannot activate the compressor, which can be due to many reasons. Are you capable of repairing automotive AC systems? If so, we can offer some help of things to look at. If not, get it to a shop for a proper diagnosis.

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post #4 of 8 (permalink) Old 06-19-2017, 05:59 AM Thread Starter
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This means that the system cannot activate the compressor, which can be due to many reasons. Are you capable of repairing automotive AC systems? If so, we can offer some help of things to look at. If not, get it to a shop for a proper diagnosis.
I can tackle a few tasks. Upto tearing down engine.

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post #5 of 8 (permalink) Old 06-19-2017, 07:33 PM
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If you have a set of gauges, check pressure on the system. If not, you can get a check AC recharge kit with a low pressure gauge and use that to at least check to see if the system has a charge. If not, then there's your issue - the system has leaked down. If you have pressure, it should be very high without the compressor running. In that case, it's probably the compressor itself or the pressure switch. To find out, you need to scan codes from the ACC system. A generic OBDII scanner won;t do it - you need SDS, or iCarsoft, or take it to a shop with an appropriate tool. Once you have the codes, then we'll know what is wrong.

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post #6 of 8 (permalink) Old 06-26-2017, 05:56 AM Thread Starter
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This means that the system cannot activate the compressor, which can be due to many reasons. Are you capable of repairing automotive AC systems? If so, we can offer some help of things to look at. If not, get it to a shop for a proper diagnosis.
I will do this this week. Thanks

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post #7 of 8 (permalink) Old Today, 11:59 AM
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If your EC light won't go out that's because the system won't let the compressor run as rudeney mentioned. if you have no pressure in the system there's your answer. If I remember on the w203 if the system gets below the minimum of 22psi the compressor will be deactivated. All AC system lose pressure naturally over the years of somewhat around 10% +/- refrigerant per year. so if your system is slightly low that could be the cause if your A/C hasn't been serviced in a long time but if you have no pressure in the system then you got a leak, which would need to be rectified.

Once again as previously mentioned, even if you refill the system, the compressor wont activate which you can't tell on these like the conventional ones as the pulley always spins but a variable swash plate deflects the pistons inside... You could try a reset on your air con control panel? I seem to remember that on some w203 models but i forgot which ones, it can reset the low pressure fault stored. You have to hold the recirc and windscreen defrost buttons together and the system will do a self bite test and actuate all the vent flaps and bunch of other magic... the lights should stop flashing after 2-3 mins. if they don't then it means you have a permanent fault which needs to be read which mentioned in previous posts and it could even be something stupid like the temperature/pressure sensor.

If you have a leak, which sounds likely, theres many well documentated guides online to find and fix A/C leaks online across all forums, its pretty much generic and doesn't vary much for a Mercedes! its worth fixing yourself if you feel confident enough, as most places can quote you a price that may even be worth the value of you car.
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post #8 of 8 (permalink) Old Today, 12:04 PM
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Also, don't forget, try to change your receiver/dryer cartridge which removes moisture from the system once your all done. this should be changed every time the system is opened/leaked out/serviced according to Mercedes, you can maybe get away not changing it if the system is properly vacuumed before refilling with refrigerent, but they are not that expensive so its worth doing.

On your postlift w203 it should be on the left side of the condensor (looking at the engine) where the high pressure port is.
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