SL/R129: SL500 AC Problem
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Joined: Jun 2009
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sl500/E320
SL500 AC Problem
Strange problem with my SL500 A/C. It works fine and blows cold air from the vents for awhile (1/2 hr?) and then it acts like it "freezes" up and the airflow slows to almost nothing. If I push EC and turn the compressor off then it will gradually increase the airflow from the vents and eventually become warm. Then I can turn on the compressor agin and it will do the same type of cycle. I have 2 people look at this and have had the system charged, etc. but it still does the same thing. Is there a control or something that does this automatically instead of me having to do it manually? Thanks loads for any suggestions as this is frustrating on longer trips.
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Joined: Jan 2006
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
The compressor is turning your evaporator into a block of ice. The first thing I would check is the signal from the evaporator temperature sensor through built-in diagnostics. The procedure for a '96 and older car is here: http://www.mercedesshop.com/shopforu...d.php?t=86546; later cars here: http://www.benzworld.org/forums/r129...air-vents.html.
