heater - air
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heater - air
Appreciate any help you can offer. 2000 F250 - 5.4 - auto. When using my heater or air,The air will keep switching from my dash vents to my defroster. I can hear a rattle up under the dash when the switch is going on. Is it something that I can test or replace. This may sound strange, but it seems to do it while I drive. When I set in the garage with either one running, it seems that It won't do it. Sure need your help. Thanks truck250 
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