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#1
07-15-2008, 10:49 PM
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w220 climate control question
my w220 is having climate control gremlins. what does it mean when the EC light is stuck on?
pressing the button has no effect at all. the system seems to have plenty of pressure. thanks!
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 ------------1967 250SeC 1979 450sel 6.9 (usa) 2009 S550 
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#2
07-15-2008, 11:47 PM
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probly low on refrigerant..
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#3
07-16-2008, 08:03 AM
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EC= economy mode, no compressor operation.
On that car 7 MOST newer MB's that can mean almost anything. The A/C controller doesn't turn the compressor directly. IT sends a signal to another control unit called a SAM (signal activation module) & that module looks at the refrigerant pressure & temp & then turns on the compressor. To diagnosis a MB scanner is needed to see what command signals are there & what pressure is in the system.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#4
07-16-2008, 09:34 AM
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on that car the evaporator temp reg is the most common cause of no compr operation and ec light on.it is in the evap case above the acc pedal and is just a push in with a two pin plug.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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