a/c mode door issue?? - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 04-22-2011, 08:44 PM Thread Starter
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a/c mode door issue??

05 F-250 just wondering if anyone has ever had a problem with their a/c mode door, it seems like it takes alot longer than it should before it actually swithces from def and floor to vent, just on start up, i know older vehicles all that is operated by vacuum but i wasnt for sure with my new truck, aby help?!?!?!?!
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post #2 of 4 Old 04-22-2011, 08:56 PM
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Originally Posted by Mrgoodwrnch View Post
05 F-250 just wondering if anyone has ever had a problem with their a/c mode door, it seems like it takes alot longer than it should before it actually swithces from def and floor to vent, just on start up, i know older vehicles all that is operated by vacuum but i wasnt for sure with my new truck, aby help?!?!?!?!
My truck did that for a while. Realized I knocked the grey vacuum line loose from the valve that is inline with the heater hose on the passenger side of engine. Reconnected the tube and no more problem.
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post #3 of 4 Old 04-24-2011, 02:46 PM
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Yes it is most likely a vacuum leak. The vacuum pump is on top of the right side wheel well just behind the vacuum tank so if it keeps on running then you have a leak somewhere. Most common leak area are the vacuum lines to your 4X4 front axle.

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post #4 of 4 Old 05-01-2011, 09:53 AM
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plug the outlet for your hubs at the valve, check you heater controls. If they work you have a leak in hub system.
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