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The expansion valve is about six inches above the accelerator pedal. I believe in OEM condition it has insulation covering it that you would have to peel away. The expansion valve can be removed using 19mm and 22mm crowfoot wrenches - the area is too tight to get regular wrenches on them but is OK for the crowfoot.
My best recommendation on flushing is to remove the expansion valve and flush the evaporator directly with a flush gun. Inject in one tube and hook the other tube up to a short length of old garden hose into a pail. You'll never get it flushed properly and then cleared of flush if the expansion valve (or even a drilled out expansion valve) is left in the car.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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