Did the search and found post about expansion valve on AC and it said on a 1983 300SD it was located under the driver's knee panel above accelerator.
My 300SD is a 1982. Is the location the same?
Post said that you would need crow feet wrenches 17, 19, 22, 24mm.

I am guessing you will need new o rings for the valve?

I need a new compressor and was going to crack my own system, put on the compressor, expansion valve - take to my dealer and let him put on the drier right before he charges it with R134 for me.

My air is ice cold right now, but my compressor is locking up when the car is idling or moving slowly. It locks up intermittantly and I cut it off and restart it and it is ok, as long as I am moving.

New compressor from my local parts guy is $275. This is not rebuilt, but a new one.

Should I go ahead and do expansion valve while I am at it?
And where should I vent the freon? I know I am supposed to recycle, but I don't have the equipment and can save some $$$ by doing the labor on the compressor and expansion vavle on my own.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup