heat/air position switch wont change! Help - Ford Powerstroke Diesel Forum
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post #1 of 23 Old 04-12-2008, 10:27 PM Thread Starter
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heat/air position switch wont change! Help

Ok i just noticed it tonight but my switch is stuck on defrosed but i can turn the switch but will not change positions. Is there a fuse that might be burnt out and not letting it change? Let me know what you think.

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post #2 of 23 Old 04-12-2008, 10:50 PM
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the switch has prolly gone bad.........

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post #3 of 23 Old 04-12-2008, 11:55 PM
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I don't know about in the 02s, but the 99s run off a vacuum pump. I would start by checking your fuses.

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post #4 of 23 Old 04-13-2008, 04:33 AM
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You may very well have a vacuum leak somewhere, If you have the auto lock hubs they are usually where the leak is

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post #5 of 23 Old 04-13-2008, 05:31 AM Thread Starter
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I saw there was a fuse for somethin like this last night

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post #6 of 23 Old 04-13-2008, 05:34 AM
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Check that fuse if thats not blown you most likely have a vac leak

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post #7 of 23 Old 04-13-2008, 06:19 AM Thread Starter
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What do i do if i have a a vac leak. Could my switch be out if so what does it look like

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post #8 of 23 Old 04-13-2008, 07:02 AM
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Bet you $5 to a bottle of urine you have a vaccum leak in the hoses to your hubs. When this happens all you get is defrost...that's the signal!

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post #9 of 23 Old 04-13-2008, 07:24 AM Thread Starter
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so what would cause a vacum leak. How do i fix it?

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post #10 of 23 Old 04-13-2008, 07:35 AM
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Broken hose...loose connection....hole.....

Check your front hubs.....go do it!

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