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A/C problem

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Old 05-21-2013, 08:36 PM
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Default A/C problem
I have a 2001 F150 with 5.4 and when I punch it with the AC on it goes to the defrost then comes back to the front vents. Has anyone ever had this problem?
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Old 05-21-2013, 09:30 PM
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Originally Posted by Brentwood Sooner
I have a 2001 F150 with 5.4 and when I punch it with the AC on it goes to the defrost then comes back to the front vents. Has anyone ever had this problem?

You have a vacuum leak. Check the hard black plastic lines that run behind the battery, most times battery acid will over time eat away at them.
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Old 05-22-2013, 08:17 AM
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I just check and can't see any black lines, do you have a picture?
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Old 05-22-2013, 08:47 AM
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No sorry i don't, follow the vacuum lines that come off the engine and go towards the firewall and fender. You will know it when you find it.
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