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vents go to default position when load is applied to engine
I have seen this problem before and fixed it on other vehicles. Usually the fix was a vacuum check valve. I have 2 Ford vans doing the same thing. When you are under load(less vacuum) the air defaults to the defrost and floor vents. I was looking where the vac... Login to read more. 
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| Engine | 4.6 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2006 Ford E-250 4.6L
| Engine | 4.6 L |
| Trans | 4-speed Automatic (Electronic) |
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