Question about 2004 Ford Crown Victoria

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Heat and ac switches between floor, dash, and windsheild

When going up a hill or accelerating the air changes places where it comes out, it's still cold or hot just comes out in wrong areas.

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The door for the air flow is controled by vacuum operated motor. there is a leak in that vacuum circuit. when accelerating, engine vacuum drops until the rpm levels off. when there is no vacuum to the motor, the default postion directs air flow to the defrost vents to make sure you're able to clear the windshield.

Posted on May 27, 2010

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