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Old 08-21-2013, 10:06 AM   #1
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Air vent stuck on defrost

My air vent while the engine is running is stuck in the defrost positions and will not blow through the vent any ideas on how to fix?
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Old 08-21-2013, 10:16 AM   #2
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My air vent while the engine is running is stuck in the defrost positions and will not blow through the vent any ideas on how to fix?
You need a new vent motor/actuator.


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Old 08-21-2013, 12:08 PM   #3
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My air vent while the engine is running is stuck in the defrost positions and will not blow through the vent any ideas on how to fix?
Maybe you can locate the vacuum diaphram motors and lube the acuator shafts. While under there with engine running, have another operate the controls for vent system and check for vac leaks.
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Old 08-21-2013, 12:14 PM   #4
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Maybe you can locate the vacuum diaphram motors and lube the acuator shafts. While under there with engine running, have another operate the controls for vent system and check for vac leaks.
I believe it to be all electronic no vacuum.
Could be wrong tho.
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Old 08-21-2013, 01:00 PM   #5
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Is your set-up an Evans? If so here's their website with their products should you need parts. There's a troubleshooting area as well.

Evans Tempcon, Inc
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Old 08-21-2013, 01:05 PM   #6
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Evans Tempcon, Inc Troubleshooting

Does any of these look like you set-up? This is the link directly to the troubleshooting section.
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Old 08-21-2013, 01:09 PM   #7
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http://www.evanstempcon.com/pdf/dzsb/vacuumtsg.pdf

Checkout #2
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Old 08-21-2013, 03:26 PM   #8
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Great reference Charlie, couldn't recall vent system maker.
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Old 08-21-2013, 04:48 PM   #9
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Typically when there is a vacuum leak, you will only have defrost, unless it's a purely electrical system. Having electronic controls does not make it a purely electrical system. If it's OEM to the chassis, and not from the upfitter, it's probably vacuum
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Old 08-22-2013, 06:42 PM   #10
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Thanks for all the info, I have not had the time to go out and work on it. Sounds like a vac problem. Dose anyone happen to know where behind the dash the lines and vac are located?
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