Larry:

I'd replace just the expansion valve and seals first to see if that is the leak -- dye will run down the pipes and it may get into the evaporator case and hence out the bottom. Saves all that work....

I still have a leak on mine, didn't fix it last year, will need to keep looking. The 0-rings between the hose manifold and pump blew, and I replaced the pump case seals too (may have been a mistake....).

Will have to look at the hose set (ouch!!!) and the condensor next....

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!