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1996 E250 why does the air shift from vent to defrost when you get in a pull or get on the gas hard?
Wiki User
∙ 14y ago
You may have a vacuum leak or a check valve isn't working in the HVAC system. When there is no vacuum in the system it defaults to defrost. Under load the engine vacuum drops to almost zero. Normally the HVAC system has a vacuum reservoir to maintain operation during this situation, but if there is a leak it cannot hold vacuum.
Wiki User
∙ 14y ago
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