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Old 12-11-2001, 08:19 AM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
On the 1981 300SD there is an evaporator temp regulator that controls the A/C compressor on-off. Should cycle at 36-40deg evaporator temperature.
As far as the rear vent operation goes, try search as that has been "hashed-over" many times! This vent is ONLY for A/C or fresh air. UNDER the seats are heater ducts that allow heat to the rear seats.
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