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  #1  
Old 05-29-2009, 10:08 PM
Technical Article Contributor
 
Join Date: May 2004
Location: Brighton MI
Vehicle: 1999 Ford F150
Posts: 12
Heater Blower Fan Fix - Only High Speed

I did my search and found plenty of help.
I would like to thank everyone who contributes information. It sure helps.
I thought I'd contribute a couple pictures.

My truck ia a 1999 F150 with manual heat/ac (115,000? miles).
My fan was working on high only. With the clues from this forum, I went straight for the resistor. And look what I found...





From the amount of rust, I've apparently been missing a couple speeds for a long time. The melted plug could have been more recent and took out #3.

For a recap:
The resistor is located on the passenger side, under the dash, near the firewall. It's difficult to see.
If you look near the kick panel, you can see the wire harness and the plugs. Follow the wire to the resistor.
The two resistor screws are pointed straight up and mine took an 8mm socket. I removed mine by feel. (unplug it after you remove it, so you can see it better.)

Zeevert

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Last edited by SSCULLY; 06-02-2009 at 09:16 AM.
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  #2  
Old 05-30-2009, 03:10 PM
Technical Article Contributor
 
Join Date: May 2004
Location: Brighton MI
Vehicle: 1999 Ford F150
Posts: 12
I picked up the new resistor today at the local Ford dealer.
p/n 4L3Z-19A706-AA
$28.14 plus tax
in stock

They didn't have the wire harness in stock, but it was going to cost over $38.

I "repaired" the old plug and put it back together. Fan works great.

Zeevert
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  #3  
Old 06-01-2009, 01:14 AM
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Join Date: May 2004
Location: Brighton MI
Vehicle: 1999 Ford F150
Posts: 12
One last picture under the Glove box...


Zeevert
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  #4  
Old 06-02-2009, 09:40 PM
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Join Date: Aug 2008
Location: Waco,TX
Vehicle: 2005 Ford F150
Posts: 1,363
Wow! I can't believe it rusted/melted like that. Nice article!
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-Lee
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  #5  
Old 06-02-2009, 11:10 PM
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Join Date: Jan 2007
Location: Erie, PA
Vehicle: 2004 Ford F-150
Posts: 2,052
Send a message via AIM to bjp207
I just did this on my dads 01 f-250, it was slightly different, but the same concept. Good write up!
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  #6  
Old 06-05-2009, 12:18 AM
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Join Date: Aug 2004
Vehicle: 1999 Ford F-150
Posts: 7
Just found this article was having the same issues. Mine also melted at the connector. I am logging this with NHTSA. This seems to be an obvious fire hazzard.

Jeremy
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  #7  
Old 06-05-2009, 09:36 AM
Member
 
Join Date: Jun 2007
Location: Outside of Ann Arbor, MI
Vehicle: 2002 FX4
Posts: 20
I just replaced the Resistor Pack (Board) on my 2002. Much the same scenario, but my connector was perfect. And an interesting thing was the amount of corrosion in comparison to the resistor packs on my 1986 and 1985 T-Birds (pulled near the same day). The T-Bird packs were corrosion free. Ths most likely has something to do with the Pack being on the bottom of the case in our trucks.

Cooter
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  #8  
Old 06-14-2009, 04:20 PM
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Join Date: Jun 2009
Location: Pennsylvania
Vehicle: 1997 Ford F150
Posts: 1
I have the same problem with my 1997 F150. I didn't notice the harness trouble until after I had purchased the new resistor. I purchased the resistor based simply on the symptoms, before inspecting it. I would like more information on repairing the harness, which I would like to do without investing another $38. Are the plastic adapter ends pretty standard? If so, do I find them at an auto parts store or somewhere else? And are the wires soldered into it? Thanks.
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  #9  
Old 10-31-2009, 01:32 PM
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Join Date: Oct 2009
Posts: 1
Thanks it works!

My lower two blower speeds were not working and my AM radio was getting alot os static. Changing this resistor did the trick, now everthing works again. Thanks, Steve
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