It sounds like the system is over filled with oil.
Here are the correct volumes.
http://www.peachparts.com/shopforum/general-information/282911-r4-compressor-c-system-oil-charge-per-wis-83-520-a.html


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__________________
ASE Master Mechanic

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Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
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1985 300SD
1983 300D

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