I had to put in a purge valve kit for our 2012 mercedes engine a month ago. Now after 30-40 seconds a knocking from compressor can be heard for 5-10 seconds then 5 seconds later air releases from purge valve. This cycle is getting more frequent. I have a bad feeling these are all connected and something is wrong. Any comments, critisizms or jokes?
air compressor knock
Discussion in 'Freightliner Forum' started by angelor, Dec 10, 2014.
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