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-   -   A/C stuck in EC mode (http://www.peachparts.com/shopforum/showthread.php?t=220019)

bcjm 04-20-2008 10:25 AM

A/C stuck in EC mode
 
I have a 1997, SL500. The A/C is stuck in EC mode (light on). I have read quite a few threads about running the A/C diagnostic program. I turned the key on, set the temperature to 72, hold the Reset for 5 seconds. I can see the 1 and 78 flashing alternately. I assume that is the in-car air temperature.

I can't go up or down to display any other number. I have the single temperature unit. I tried the Auto button, up/down button, defrost etc.. Nothing seems to work. Is my unit defective or I was just pressing the wrong button?

Thanks
Bob

stevebfl 04-20-2008 10:52 AM

Try the blower + and -.

bcjm 04-20-2008 05:08 PM

OK that works using the fan +/- button. Here is what I got:
1 - 75
2 - 67
3 - 73
5 - 73
6 - 80
7 - 4.7
8 - 71
9 - 37
10 - 125

According to http://pages.prodigy.net/jforgione/MB_AAC.html
I don't see anything wrong. The AC system shows about 85 psi on both high and low side without compressor ON which is about the same as #7 (4.7 bar). Is this number (pressure) too low which causes the EC to be on all the time?


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