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Old 10-06-1999, 01:01 AM
MB STARS MB STARS is offline
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
Have you read your owner's book, the book tells you how air condition & heating system
works.the center vent never open in heat mode
hope this help.

MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner