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I did what this guy in the video did and I cleaned my solenoid didnt even replace it just sprayed it down REAL good. Car runs AWESOME! Fresh ATF = New Car Feel.
On my 99 GS3, the transmission cooler hose on the driver side is the "supply" line meaning it comes from the transmission to the cooler, the hose on the passenger side is the "return" line meaning it will come from the cooler back to the transmission. When doing a flush via the cooler lines to avoid a mess knowing which is which helps. I made a huge mess, but you dont have to. If you use the supply line remove the hose from the transmission itself and place the clear hose there, if you use the return line instead, unplug the hose for the cooler itself and connect the clear hose there. The clear hose I bought was from Home Depot, the inner diameter was 3/8, it ran about $5 bucks. You will be amazed about how black the ATF comes out until it flows bright red. The way the magnet looked on his drain plug was how my magnets looked in the pan. Magnets were covered with metal ***** of wear and crap. The magnets were so covered they could no longer attract metal shavings like it was intended to. Also reused the transmission filter which was also hosed down with CRC MAF cleaner.