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When accelerating the ac air switches from the front to the defrost whats wrong?
Wiki User
∙ 12y ago
In most cars the duct selection controller is vacuum pressure actuated. There is an apparent problem with the selector diaphragm. When you accelerate you create more vacuum pressure that overwhelms the diaphragm and hence the duct change. It may be as simple as a leaky hose in the dash. Most systems default to the defrost vents in the case of vacuum failure.
To sum it up, it is a vacuum problem.
Y-THINK-Y
Wiki User
∙ 12y ago
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