Heat/AC works but stuck on Defrost Mode?? - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 12-13-2013, 04:54 AM Thread Starter
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Smile Heat/AC works but stuck on Defrost Mode??

Hi All,

I got a 2001 f250 crew cab....The heat and ac button works along with the hi-low button......The position switch will turn off in the off position but its stuck on defrost mode...it wont go to any other position for your feet or head etc......when its in the defrost mode and i turn it to another position, while driving and stepping on the gas the blower makes like a swoosh and whistle sound inside the cab...once I let off gas completely it stops and starts again when I hit gas again.......

Is there a valve that opens and closes to change position of the air inside the cab?? Could it be stuck? ......where would I look for that??.....

Any help is much appreciated....Thanks!!
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post #2 of 19 Old 12-13-2013, 07:23 AM
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sounds like a vacuum leak

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post #3 of 19 Old 12-13-2013, 08:04 AM
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I just bought a truck and it has the exact same symptoms as this. Please post if you find out the cause of the issue.
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post #4 of 19 Old 12-13-2013, 12:32 PM Thread Starter
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Smile

I'll try and diagnose the issue when i get some time and ill email you...Like wide of you get it fixed but I'm going to try to fox on my own..
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post #5 of 19 Old 12-13-2013, 01:02 PM Thread Starter
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Like wise if you get it fixed...let me know...much appreciated.....I think its maybe the hoses cause the pump is working....I know my 4x4 low works..but my 4x4 high grabs when it wants to
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post #6 of 19 Old 12-13-2013, 01:07 PM
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sounds like a vacuum leak to me

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post #7 of 19 Old 12-13-2013, 08:22 PM
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vacuum leak. If a leak is detected it will automatically resort to defrost. My truck does it whenever i put my truck in 4wd because there is something wrong with my manual hub conversion.

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post #8 of 19 Old 12-13-2013, 08:58 PM
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yeah just get you a plug & plug that bastard or probably replace all the vacuum lines going to your hubs.

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post #9 of 19 Old 12-14-2013, 01:50 AM Thread Starter
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How big in diameter are the vaccum lines on a 2001 f250 crew cab?...I am assuming I would have lines going to both front tires and one on passenger side leading to a heat/ac unit on my fire wall correct??......I havent looked yet cause were in for snow, but if there are lines going to both front tires...are the lines on the outside of the hub when I pull the tire off or would i have to pull the drum and rotor off to connect hose where it needs to go???

Thanks Guys
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post #10 of 19 Old 12-14-2013, 06:43 AM
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If your just wanting to plug it, the vacuum pulse solenoid is on the passenger fender next to the battery. Mine has two tubes going to it, one is black the other is red. On mine it removed just before it 90's down at the union. We got a lot of ice last week & that's what I did to prepare for it. Here is a pic for you, the red circle is where I capped the line. The blue circle is the vacuum solenoid.

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