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EC light came on just before I took my 01 c320 in for B service. A/C stopped working when EC light came on. I assumed I needed a refrigerant charge. I took my vehicle to a local import mechanic (with whom I've been very pleased up until this point versus the stealership on the other side of town). My mechanic did the B service and got specification pressure on the refrgerant but the EC light is still on and the A/C is not working. Mech said that the compressor is not turning on. He's not sure why. Anyone know of a reset procedure for EC fault?

Thanks!
 

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2004 C230 Kompressor Sport Coupe
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The EC is an indicator, not usually a fault in itself. You need to put an A/C person on this. The refrigerant only gets out if there is a leak, so you need to find and fix that. Unfortunately if the computer is seeing a sensor fault that keeps it from engaging the A/C you will need to get SDS on there and read out the codes. A good A/C person might be able to suss it out with just gauges and experience, if you don't have SDS available.
 
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