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Try to observe if the air flow is remaining the same. If not, try bumping the fan up to full high while stopped or slow and then proceed to highway speed.
You may have a control flap that is blowing or pulling shut at the higher inflow air pressures at speed. It is possible that running at higher fan speed will keep the flap open. If that is the case, that will keep you warm until you feel like going in to deal with it inside the dash.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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