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The MB AC manual suggests you take the old Txvalve and turn it into a flushing fitting..you won't be using it again anyway... you pretty much take the hoses apart and flush from the firewall forward.... there is a flushing ' gun' for using liquid flush agent...probably much cheaper than the cans....
There is lots of stuff in the archives about this... I am in the middle of a stuck axle nut on my Gravely 5665...
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