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Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53160
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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1989 560 sel blower motor runs but no air flow out vents

Customer Question

1989 560 sel blower motor runs but no air flow out vents
Submitted: 6 months ago.
Category: Mercedes
Expert:  Marty replied 6 months ago.

Hi, if the blower motor is running the air flow is probably blowing up through the defroster vents. If that is the case the problem is caused by a vacuum leak in the vent system. The vents are opened and closed by vacuum. When a leak develops in the system the air will default to the defrost mode.

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Marty