The AC system may not blow cold air due to Refrigerant leaks from AC manifold hoses. Leak diagnoses, most commonly using leak detection dye, may be necessary to determine the exact location of any leaks.
Car Problem Reports
Mercedes-Benz 190E Refrigerant Leaks From Manifold Hoses May Cause AC Performance Problems
Mercedes-Benz 190E Problem
Average Mileage: 187,500 mi (145,000 mi - 230,000 mi)
Visitor, 1993 Mercedes-Benz 190E, 145,000 mi
Air condition not blowing cold air
We add freon but air gets warmer & warmer again.