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Old 07-08-2012, 02:31 PM   #1
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Dash blower fan E-350 V-10 gasser

Often when we want full (high) blower fan operation it will not come on, likewise when it is operating on full (as in air conditioning) at road speed it will shut off on its own. this sounds wierd but it most often happens when going uphill at 60-65 mph. anyone know if a resistor would do this? Looking for any thoughts and history of this happening.
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Old 07-08-2012, 03:11 PM   #2
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Dash blower fan E-350 V-10 gasser

I think it's vacuum related but I don't know where to tell you to look.
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Old 07-08-2012, 04:05 PM   #3
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Re: Dash blower fan E-350 V-10 gasser

The High speed fan is direct 12 volts and might have a relay, I could check my 2008 manual. The other three speed are the resisted ones. Usually if the resister is bad you have no 1, 2 or 3 and only high works.

As for the going up hill part that sounds like vacuum. Any chance the fan is blowing but changes from out of the dash vents to the defroster on top of the dash? On most cars and trucks with vacuum operated heater and air conditioning controls defrost is the default if it loses vacuum. If thats what is happening its most likely a check valve
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Old 07-08-2012, 04:32 PM   #4
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Re: Dash blower fan E-350 V-10 gasser

Loss of vacuum going uphill is for a gasser. Don't know if he has a gas or a diesel engine. Diesels have a standalone vacuum pump since a diesel doesn't make vacuum. edit Oops, read the title, not the post and it is a gasser.

To me, it sounds more like a loose connection or an intermittent switch.

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Old 07-08-2012, 09:34 PM   #5
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Re: Dash blower fan E-350 V-10 gasser

I had the problem in my 6.0 that caused the vents to switch to the defrost setting. It was a cracked vac hose or fitting that Ford broke when they had done some warrantee work. At higher speeds the door would swing to the defrost position. I also had to start it on low or it would stay defrost.
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Old 07-16-2012, 08:31 AM   #6
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Re: Dash blower fan E-350 V-10 gasser

My 06 V-10 Quigley converted E-350 did the same thing, it was rodent damage to the vacuum system.
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