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Generation 11 2004-2008 F150


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  #1  
Old 12-31-2011, 10:14 AM
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O'Rattlecan O'Rattlecan is offline
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2005 HVAC blower only works on 'High'

My 2005 F150's HVAC blower quit working on settings 1, 2, & 3. It only works on 4 which is the highest setting. This is getting very annoying and I decided to put in a new switch to fix it. The new switch did not do the trick and it's still running only when I switch it to '4'.

These trucks are too complicated to just dive in and start trouble shooting.

Does anyone have any ideas? Are there any TSB's out there?

Ryan
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  #2  
Old 12-31-2011, 10:22 AM
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Quote:
Originally Posted by O'Rattlecan View Post

Does anyone have any ideas?
Why does everyone always miss the obvious....don't use it duh!

I have heard of that happening but never had it happen to me
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  #3  
Old 12-31-2011, 10:22 AM
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Sounds like you need a new blower motor resistor.

Edit: http://www.autozone.com/autozone/parts/2005-Ford-F150-1-2-ton-P-U-4WD/A-C-Heater-Blower-Motor-Resistor/_/N-jn8szZ91tag?filterByKeyWord=blower+motor+resistor& fromString=search
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Last edited by 73F100Shortbed : 12-31-2011 at 10:26 AM.
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Old 12-31-2011, 10:23 AM
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There's no way these things are still using resistors in 2005.

Ryan
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Old 12-31-2011, 10:27 AM
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Of course they're still using resistors.

How else would they do it?
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Old 12-31-2011, 10:27 AM
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Check the link I posted. It's not a hamster in the wheel spinning the motor around
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Old 12-31-2011, 10:28 AM
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They have a module for everything. And if a resistor was shot, it probably wouldn't behave the way it was behaving. It would be on high on all settings, or it wouldn't work at all.

Does anyone have any experience with this problem or are we just throwing darts at the board?

Ryan
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Old 12-31-2011, 10:29 AM
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No when the resistor fails in only works on the high setting not 'high' in all settings.
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Old 12-31-2011, 10:29 AM
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Seriously, dude- that's textbook bad resistor symptoms.

Replace the damn thing for $20.

EDIT: the reason it's not on full-speed on all settings is because the resistor fails open, not closed. It still works on high because the high setting bypasses the resistor.
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  #10  
Old 12-31-2011, 10:32 AM
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I will bet on it since I've replaced at least 75 resistors in the past all with the same symptom and fixed the problem every single time. How about if I win we switch statuses for the day? I get to play 'admin'
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