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When i hold in The ec Buton The rest Buton blinks 3 times why.

My ac does not blow cold air The compressor starts, no hissing soud in The mid went. The onley error code is the rest pump,and that pump does not have anney ting Whit The ac. Aney one knows what to do.?????????????
 

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1990 Mercedes-Benz 420 SEL(RIP),1997 Mercedes-Benz E420
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Holding the EC button will engage the climate control diagnostics. Let it flash again and press the left or right AUTO button. This will give you a code readout. Write it down and post them. It would also be helpful in your case to update your information so that people know what their dealing with.
 
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