GL320 2007-2009 V6 3.0L Diesel W/Airmatic X164 Series GL350 2010-2012 V6 3.0L Diesel W/Airmatic X164 Series GL450 2007-2012 V8 4.6L Petrol W/Airmatic X164 Series GL450 2007-2009 V8 4.7L Petrol W/Airmatic X164 Series GL550 2008-2012 V8 5.5L Petrol W/Airmatic X164 Series ML320 2007-2009 V6 3.0L Diesel W/Airmatic W164 Series ML350 2010-2011 V6 3.0L Diesel W/Airmatic W164 Series ML350 2006-2011 V6 3.5L Petrol W/Airmatic W164 Series ML350 2010-2011 V8 5.5L Petrol W/Airmatic W164 Series ML450 2010-2011 V6 3.5L Petrol W/Airmatic W164 Series ML500 2006-2007 V8 5.0L Petrol W/Airmatic W164 Series ML550 2008-2011 V8 5.5L Petrol W/Airmatic W164 Series ML63 AMG 2007-2011 V8 6.2L Petrol W/Airmatic W164 Series ML63 AMG 2007-2011 V8 6.3L Petrol W/Airmatic W164 Series164 320 12 04, 164 320 12 04 05, 164 320 1204, 1643200004, 1643200204, 1643200304, 1643200504, 1643200904, 1643201204, 164320120405, A1643200004, A1643200204, A1643200304, A1643200504, A1643200904, A1643201204.Vehicle sagging. Compressor works erratically or not at all. Unusual sounds coming from compressor.