Had a bad leak in the A/C system in the 400E, 85K. All I can think about is the evaporator fun thing, so I did the next best thing and put a can of 134 stop leak in the system. Before, the system was losing it's charge in 2 days,,,, it's been a week now and still no bubbles in the sight glass and plenty of cold air. We'll see how long it holds and it has a dye in it so if the leak does reappear, maybe I'll be able to pinpoint it.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

O rings are probably shrunk from using R134a oil. Look for oily residue on the connections at the evaporator, receiver/dryer, and compressor manifold.

The o-rings on the compressor itself on the TE have gone bad, same cause I believe.

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!