Howdy all,

Since I have received good advice on everything that I asked about in the past, here we go again!

'04 F150 FX4 SCab
The vent/fan speed dial for the ac/vent/fan is the issue. It does not blow at all on the first and second settings, but it does blow like normal on the third and fourth settings. Since it blows I know it's not the fan motor itself. What could be the problem?

Thanks in advance!

 

Does anybody have any input? Thanks!

 

The switch contacts, maybe...

 

Eh, not sure about the newer models - on the older ones, loss of intermediate speeds was almost always related to a failed blower resistor module - relatively cheap fix, hardest part was usually to find where it was located.

 

Chances are the resistor is bad as previously suggested. My '05 FX4 just had the same issue so the fix should be identical for an '04. I had to go to the dealership to get the new resistor ($20-25) because they are slightly difficult to find.

#1 Locate the old resistor:
Open the Glove Box. If you push in the right side, you should be able to get the glove box to release and completely open up. There is some black duct work that runs behind the glove box. You'll find the resistor in somewhat plain view. Two screws hold it in.

#2 Replace.
It is honestly as simple as pull the old one out, slide the new one in, screw it down.

Once I found the thing, it took all of 5 minutes to replace it and test to make sure everything works properly.

 

Thanks for the input. A mechanic here at work also told me to replace the switch and pigtail, that often times the reason the resistor failed was due to a bad switch. I'll change the resistor out tonight and see how she works. thanks again guys