Replacement for: 2002 2009 GMC Envoy Replacement for: 2005 2009 Saab 9 7x Replacement for: 2004 2007 Buick Rainier Replacement for: 2003 2007 Isuzu Ascender Replacement for: 2002 2004 Oldsmobile Bravada Replacement for: 2002 2009 Chevrolet Trailblazer Please perform the following steps before replacing the compressor1.Separate and clean each pipe in the system. Pour the cleaning agent into the condenser and evaporator for a period of time, and then clean the cleaning agent and pollutants together. Do not clean the compressor dry bottle, liquid accumulator and throttle pipe to ensure that there is no residual cleaning liquid in the air conditioning system2.Clean the surface of condenser and evaporator, and check whether the speed of cooling fan is normal3.The expansion valve is cleaned or replaced, the dry bottle and the pipe filter are replaced4.Before installing compressor, check compressor oil, vacuum and fluorine, check high and low pressure (high pressure 180 200 psi, low pressure 30 40 psi)