12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

NO AIR OUT OF THE VENTS

Old May 2, 2012 | 10:26 PM
  #1  
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Default NO AIR OUT OF THE VENTS

I cant get the ac or heater to blow out the vent it only blows out of the defrost and floor I was wondering if anyone had any ideas?
 
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Old May 2, 2012 | 10:29 PM
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Your switch proably broke that redirects the air.
 
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Old May 2, 2012 | 11:12 PM
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The switch on the dash?
 
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Old May 3, 2012 | 05:14 AM
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The switch on the dash has a slide bar on the back side. On mine the rubber that blocks and redirects the vacuum came loose and wadded up not letting it switch off of def. It's not to hard to take apart and reglue the rubber to the slide bar.
 
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Old May 3, 2012 | 08:47 AM
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I had that problem and it ended up being a broken vacuum line under the hood. Worth a look.
 
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Old May 3, 2012 | 09:55 AM
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Originally Posted by daveO
I had that problem and it ended up being a broken vacuum line under the hood. Worth a look.
Agreed! i used to have an awesome vacuum line diagram, computer crashed tho
 
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Old May 3, 2012 | 04:25 PM
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Originally Posted by daveO
I had that problem and it ended up being a broken vacuum line under the hood. Worth a look.
def sounds like vacuum line broke
 
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Old May 4, 2012 | 10:08 AM
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If it was vacum then wouldnt my 4x4 not work and wouldnt it not switch from floor to defrost?
 
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Old May 4, 2012 | 10:35 AM
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Not necessarily... The two lines that run toy you 4wd actuator may not be broken and still work fine!
 
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Old May 4, 2012 | 12:00 PM
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Originally Posted by 1AMatt
Not necessarily... The two lines that run toy you 4wd actuator may not be broken and still work fine!
Agreed, the line that was broken on my truck was the one that runs to the passengers side across the firewall that feeds into where the blower is.
 
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