Hi
I did several searches using the keywords that make sense to me, and found nothing about the problem with my '07 F150 super Crew.

I thought I had an after market service manual, but I guess not and I'll have to get one.

The other day, I noticed that the cabin blower works fine on speeds 1, 2 & 4 but while on speed 3, it blows the same as speed 2.

Based on some of what I read, it seems the different speeds simply switch between different series resistors. That being said, unless the speed-3 resistor increased to a similar value as speed-2 (which seems a bit unlikely) I'm a bit confused about this malfunction.

Also, where might I find this speed control board?

Any help would be appreciated..

Thanx

 

I had the same problem but it was #1 speed that wasn't working . It's an easy fix, the circuit board is about $30 and it is located on the passenger side down at the fan motor. You will see an electrical connector with 2 screws. Simply unplug it and remove the screws and install the new circuit board. If you search I think there is a forum that explains it with pictures. Good luck !

 

I forgot to tell you that mine was located behind the glove compartment, simply remove it and you will see the connector. Yours should be located in the same place .

 

Thanx! I'll look into it...

 

I hit three different auto parts stores and their computers suggest a haynes manual. That particular haynes manual only covers pickups to 2003 and expeditions to 2009.

Am I missing something?

 

I went to the Haynes website and found the part number and just ordered the manual from my local Napa.

 

Yeah, the symptoms didn't seem to call the resistor board to me. I replaced the fan speed switch and all is working fine now.

Picking up trim removal tools from a harbor freight REALLY makes the job much easier and does not damage the interior. Only $6.50 for a 4-piece tool set.