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Old 07-07-2007, 08:24 PM
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Join Date: Dec 2003
Posts: 76
1997 S320 A/c Ec

I have a 1997 S320- the EC light remains on and, as a result the AC compressor does not go on. Is this because of low refrigerant level OR a bad relay? If it is a bad relay, which relay operates the compressor? Klima?

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Old 07-07-2007, 10:12 PM
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Join Date: Aug 2001
Location: Houston, Texas
Posts: 393
What is the EC light and how do you know that this light is related to a/c control ? There are a lot of components that combine to control the compressor, and if you have the Klima relay like I have on my 87, 260E, then there is a step by step process I have posted to test the compressor circuit.

ac still not working after ac conversion 87 300SDL
Saumil S. Patel
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Old 07-07-2007, 10:33 PM
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Join Date: Jul 2003
Location: Ocean Isle Beach, NC
Posts: 2,526
See this one too - 210 chassis climate control problem
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles

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Old 07-09-2007, 12:50 AM
A. Rosich's Avatar
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Join Date: Nov 1999
Posts: 883
The EC switch turns off the compressor to revert the system to regular ventilation (no a/C). If the light stays on, your refrigerant charge is low, it is a failsafe mode.

Now, I just hope yourrefrigerant level is not low because of a leaking evaporator...

A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]
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