Most individual compenents of the A/C (with the exception of the condenser) have been replaced over the last year on my 300D.
Now I get ice cold air like never before when I am driving slowly in city traffic or idle.
However, when I get onto speed on the freeway, the efficiency is much less, it almost feels as if there is 'warm' air coming in through the outer inlets and the center vents are less, also.
What is the problem related to?

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"Schwarzbraun ist die Haselnuss":

1979 300D 234.000 Miles "Brownie"
daily driver,
1979 6.9 Sundays to the Tavern
and car shows "Big Brownie"