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Vacuum Leak???

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Old Aug 24, 2012 | 08:54 AM
  #1  
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Vacuum Leak???

I have a 2002 Ford F-250 w/ 7.3L. I beleive there is a vacuum leak in my system somewhere. My A/C is stuck on defrost on any setting. But I have an electronic shift 4x4 and it clicks on instantly and I think that is vacuum opperated. Where should I start to try and fix this problem.
 
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Old Aug 25, 2012 | 05:32 AM
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Mine did the defroster thing also...first thing I checked was the connection to the vacuum box where the pump is. It was a loose connection.
 
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Old Aug 26, 2012 | 12:21 AM
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I just started playing with some hoses and i followed two hoses to this little box thing that has wires going to it. I do not know what this is, or what it could be called.
 
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Old Aug 26, 2012 | 04:27 AM
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That is the vacuum reservoir and pump.
 
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Old Aug 26, 2012 | 05:29 PM
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not those, its two lines that come off the reservoir that go into what im taking about. but its right next to both of those. i'll take a picture of it when this tropical storm passes
 
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Old Aug 26, 2012 | 05:39 PM
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Bad seal in the blend door controller.
 
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Old Aug 27, 2012 | 12:52 AM
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Just start pulling and plugging hoses. Start at the ones u can reach by the pump it self, play with those for a while. Then if your getting vac still, go to hubs and unplug the hoses and plug them with something ( I used a Robertson....lol) I found out both my hub seals are gone, and with other diagnosing my solenoid is no good.....
 
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Old Aug 27, 2012 | 05:11 PM
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I would check the vacuum seal on your hubs or at the vacuum solenoid.
 
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