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Ac/ec button is constantly on and no cold air is coming out in 1997 C 280 Mercedes Benz.
This car had a new compressor put in about 9 months ago worked fine for 3 months then the car was parked for 6 months. After that the Ac worked but not great so we injected dye to find a leak but we could not so we drained the system then recharged worked Ok for about 2 weeks. Now the EC button is on all the time and no cold air is coming out.
I tried to reset it using the same resets for E320 but I could not get any DTC codes I also could not see sensor number 4 although I saw all the other sensors
Thanks.
 
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