Incorrect Air Delivery and/or Temperature From Climate Control System on Mercedes-Benz C230

The vacuum manifold for the climate control actuator may develop a leak, This can cause poor or no operation of the air delivery and temperature control flaps.

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Average mileage: 150,000 (150,000–150,000)
4 model years affected: 1997, 1998, 1999, 2000
5 people reported this problem
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1998 Mercedes-Benz C230 150,000 mi,
when accelerrating air goes to the side vent and returns to the middle after letting go of the gas pedal