SilverCLK430

my AC compressor won't engage because the EC light is on. Do you know how to reset the EC light, so the AC compressor will work. I've gotten it to work in the past, the compressor is fine. Please advise. Thank you.

Plutoe

EC light is the compressor safety valve--you have faults and they need to be cleared before the compressor will start,however most importantly fix the fault before you start the compressor----search the W210 forum for the two tests--actual value and fault tests.The actual value will give you the data as to why the fault!!

MarcusF

Plutoe is right - put the AC in diagnostics mode and post the codes.

Here's how to get the diagnostics - www.fitzhughmedia.com/MBF/acdiag.html

blackopal

the bypass is


ignition on, make sure AC system is turned on (EC light will be lit)
Switch off ignition, for say 10 seconds
Switch ignition back on, AC system comes on and this time press the EC button. Light should go out, start you engine and your AC should operate, assuming it is ok as you say.