Heat/Air only blows from Defrost - Ford Powerstroke Diesel Forum
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Old 01-22-2014, 05:11 AM
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Heat/Air only blows from Defrost

Just recently bought a 2001 F350 7.3 Diesel Lariat with a few minor issues. Found that the air and heat only blow from the defrost and no where else. Read that this could have something to do with the ESOF in the hubs. The guy that had it before me had aftermarket hubs on so the hubs must be locked before using the switch to put it into 4 wheel drive. Need help diagnosing this and how to fix the issue or what i will need to check it.
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Old 01-22-2014, 05:21 AM
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I actually had a guy help me with this on here as I had the exact same problem. There is a pretty simple test to see if you have a bad vacuum pulse solenoid (which is what mine was and it is a cheap fix). If you go under the hood on the wall right above the passenger's side front tire, you should see a vacuum pump and a pulse vacuum hub solenoid right next to it with a red and black connected tube attached. If you get a buddy to hop in the car car with it in the wait to start position... pull that red/black tube out and use your fingers to firmly cover the two holes that you just removed (one should have airflow). After about 10-15 seconds, have him adjust the control to something other than defrost and if it redirects properly, your solenoid is more than likely bad. If it doesn't do anything, it is probably a vacuum leak somewhere else.
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Old 01-22-2014, 05:29 AM
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Will check that once i get home. Could you possibly link the part I will need if this is the issue just so i have an idea of what it is. Thanks.
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Old 01-22-2014, 05:41 AM
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Sometimes the vacuum connection comes undone under the glove compartment and you have to do is click it back together.


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Old 01-22-2014, 05:54 AM
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Here is solenoid... Pulse Vacuum Hub Solenoid Valve

You may also want to get a vacuum pump too just in case it is one of the two going out (assuming what I said above works). If you are okay with getting it used, I recommend going to a pick and pull and taking one from an old vehicle. Probably would cost you about $20-25 for both rather than $150 or so brand new.
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Old 01-22-2014, 10:30 AM
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Will be checking all these possible issues when i get home. Thanks.
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Old 01-23-2014, 03:17 PM
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mine was a bad solenoid, bought oem brand new from amazon for about $50.
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