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Old 03-24-2014, 07:35 AM
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No heat! Need help

I have a 2004 6.0 and my heat only works intermittently while driving. I need some help on where to look next. Here's what I've done so far...
-drained and flushed coolant (several several times)
-new radiator
-new heater core
-new thermostat
-new water pump

After fixing all of those I'm still not getting any heat, so I figured I may have a vacuum line issue, but my air doesn't default to defrost. Blend door actuator is rotating so I know it works... But I'm not sure exactly where I should start next. Any help is greatly appreciated.
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Old 03-24-2014, 02:24 PM
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Check the heater hoses. There is a vacuum operated shutoff valve inline on one of the heater hoses. Make sure it is seated properly and the line isn't cracked anywhere.
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Old 03-24-2014, 02:53 PM
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I don't have any valve on my heater line, could that be me my problem? The grey vacuum line is just plugged in to a spot on a box that doesn't have a hole in it, it seems like a place holder...
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Old 03-24-2014, 07:49 PM
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Do you have a picture?
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Old 03-25-2014, 02:33 AM
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First pic of where the vacuum line is connected, I believe the picture got turned 90 degrees counterclockwise
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Old 03-25-2014, 02:36 AM
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Second picture of vacuum line unplugged, rotated again
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Old 03-25-2014, 11:53 AM
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can you get a picture of the heater hoses where they run along the pass valve cover?
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Old 03-26-2014, 10:00 AM
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im interested myself - have similar issues!
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