2002 f150 a/c and heating blower stopped blowing - F150online Forums



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2002 f150 a/c and heating blower stopped blowing

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  #1  
Old 07-13-2010, 01:56 PM
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2002 f150 a/c and heating blower stopped blowing

I have a 2002 f150 5.4 v8 and the blower Just stopped working and I was wondering if anybody has had these problems before and how they fixed them
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Old 07-13-2010, 02:29 PM
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After checking fuses this would be the next place I would look.
Be sure to post the results, or ask for more help if this don't fit your problem. The location of the resister is described at the bottom of the first post

http://www.f150online.com/forums/art...igh-speed.html
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Old 07-13-2010, 04:24 PM
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I have checked the fuses and switched that one with one that I know works and it still didn't work. We have checked if the fan still works by attaching an outside source and it does. I have looked at a few other forums and many of them think it is the blower relay. I have a new relay but we can't locate it. If anyone knows where that relay is please let me know
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Old 07-13-2010, 04:40 PM
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Your owners manual will show you where the relay is. If you don't have the manual, you can download it from Fleet Ford.

https://www.fleet.ford.com/
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  #5  
Old 07-13-2010, 05:05 PM
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I have the owners manual and I am not sure what it would be called (a/c clutch relay maybe)
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Old 07-13-2010, 05:17 PM
glc
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Does the fan work or not work on the highest speed?

In my 03 manual:

105 (PDB) - Blower, 40a maxifuse

I do not see any relay for the blower motor.
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  #7  
Old 07-13-2010, 05:22 PM
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There is no power going from the switch to the fan so it will not turn on at all
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Old 07-13-2010, 05:23 PM
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I already tried that fuse with one that I know works and it still didn't work
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  #9  
Old 07-13-2010, 09:08 PM
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I believe the power goes from the switch to the blower resistor then to the fan. You can find the blower resistor by looking from the floor up just behind the glove box.

Look for something like this:

http://www.diychatroom.com/attachmen...cation1-fw.jpg
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Old 07-14-2010, 03:09 AM
glc
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If the blower resistor blows out you will still have high fan speed. If high speed doesn't work the switch itself is probably bad.

Can't say anything else because you did not directly answer my question about high speed.
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  #11  
Old 07-14-2010, 09:02 AM
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Quote:
Originally Posted by Radams View Post
There is no power going from the switch to the fan so it will not turn on at all
The switch is not supposed to supply power to the motor. The switch is installed in the ground side of the motor circuit and is intended to change the resistance of the ground (low side) circuit (via the blower resistor) to change the current flow through the motor and hence its speed.

Locate the blower motor connector. One lead should be battery voltage whenever the blower should be operating. The other lead should measure anywhere from zero when the switch is in HIGH to several volts when in lower speed settings.

If you have battery voltage on one lead but zero volts in all switch settings on the other, the blower motor is bad.

If neither lead has power when it should, check the blower motor relay located in Aux relay box #4.
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  #12  
Old 07-14-2010, 12:40 PM
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Where is the aux relay box #4
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Old 07-14-2010, 12:41 PM
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It doesn't work on any speed
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  #14  
Old 07-14-2010, 12:59 PM
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Look under the hood... driver side fender area
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Old 07-14-2010, 01:58 PM
glc
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Got a reference to that? My owner's manual doesn't show an aux box, just the in-cab box and the PDB under the hood.
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