W116, Rust Repair

Replaced a/c compressor, evacuated and charged a/c, tested for leaks (found none), replaced a/c belt, replaced receiver dryer, replaced expansion valve, flushed a/c lines. I had cool air (not cold - about 60 degrees at vent) for about three days. Now the air is neither cool nor dry. With the a/c switched on at start up, I hear a squeal. Accelerating eliminates squeal and it doesn't return. Belt is tight. Everything seems to be right but, something isn't and I can't figure it out. Can anyone help me diagnose and fix this?

Hi All: I have some water accumulating in two places, I cannot find the source of either. In the trunk, behind the driver side wheel well. The gaskets on doors and trunk are all new. There is a small seam in the rear window gasket. Also, there is water draining from the car, under the driver side front door. I cannot see anywhere that this could be coming from. Thanks in advance for any help. Jon P.

I have a question about the "Manual Climate Control Override" kit, specifically about installation of the valve included in the kit. The valve has an arrow on it, apparently indicating flow direction. But there was nothing in the MercedesSource instructions addressing valve orientation. Does it matter which way the coolant flows through the valve?