I had the same problem. Replace the climate control. Its located on
the firewall nearer to passenger side. This fixed all my heat and air
conditioning problems exactly what you are describing
> Hello all, I have a 1993 190E 2.3L. The heat seems fine at the
> speeds, but at the highway speeds it seems highly inadequate.
> ambient temperatures are in the mid 30s Fahrenheit. Does
> anyone have
> any suggestions?
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