Patent ID: 6474370
Filing Date: 2002-11-05
Classification: F01M,F16H

Abstract:
A method of replacing a first fluid in a system with a second fluid using a service apparatus having a plurality of fluid paths, a service pump, a processor, a first hose and a second hose, said system having a system pump, a system inlet and a system outlet, said method comprising the steps of:connecting said first hose to said system outlet; connecting said second hose to said system inlet; starting said system pump to pump said first fluid out of said system outlet; circulating said first fluid being pumped out by said system pump back into said system by selecting a recirculating path of said plurality of fluid paths to direct said first fluid from said system outlet and said first hose to said second hose and said system inlet; selecting a replacement path of said plurality of fluid paths to pump out said first fluid from said system through said system outlet and said first hose to a waste tank; pumping in, using said service pump, a second fluid from a source tank into said system through said second hose and said system inlet; performing a measurement of said first fluid in said waste tank using said processor; performing a measurement of said second fluid in said source tank using said processor; and controlling said service pump by said processor based on said measurements.