Thread: Heat on 420SEL
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Old 11-15-2002, 05:02 PM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The air flow is controled by vacuum actuators that move flaps in the heater box.
Sounds like your car isn't GETTING the vacuum to switch the actuators as needed to open & close the vents.
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