I have a 2000 Taurus. A/C works perfect except when I step on the gas pedal. Every time I suddenly accelerate my car (more than 3000 RPM) the A/C blower stop blowing air from the front vents and start blowing the same cold air but trough the widshield vents (windshield defrost). Once I depress the gas pedal and RPM are low, the air flow switch back from the windshield vents to the front vents. Any idea whats going on?
Sounds like some stray vacuum pressure happening, when you are accelerating vacuum pressure (which all comes from the inlet manifold) will be high, and it seems it is then pulling your vents to the screen, when you drop revs, the pressure drops and the vents go back.
I dont know the vacuum line setup on a taurus, but I bet it would happen on high fan with air vented from outside as well.
I did put something here, but it vanshied, I think
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