Hi all,

I've been browsing the forum for weeks now trying to find information on my issue, but I am having no luck, so I'll post my question.

2007 F150 XLT 4x4 My blower (fan) intermittently turns itself on and off, but only if the mode selector is in specific locations. I have all fan speeds working, it is not the fan speed resistor in the air box or the fan relay in the fuse panel. The fan (and ducting) works properly when set to defrost, defrost/floor, and floor settings. The fan works intermittently when the mode selector switch is set to the dash vents, dash/floor and Max AC settings. Please understand, when the mode switch is used, all the ducting changes as it should. Air comes out where it is supposed to. The only issue is that randomly, sometimes the fan itself just turns off (or turns back on.) If the mode happens to be Max AC, the AC indicator LED also goes off when the fan goes off. Has anybody seen this issue before? Is it purely an actual issue with poor contact in the mode select switch or is there something else in the system I can be checking out? Thanks for the help.

 

It sounds like the switch to me since it is working properly in some positions and not others. I may be wrong, but I don't believe there is anything other than the contacts in the switch that is unique to the working/non-working modes.

 

I have an 04 lariat with electronic dash. I got in my truck one morning and it was the first time this year I had to run the heat. I noticed the dash display flickered on and off never thought much of it. When I got off work it was warm enough to run the air so I switch back to ac and it blew warm air never got cold about half way home the entire display went out. I checked all the fuses and relays and found nothing wrong. I called the ford dealer where I had bought the truck and they said to unhook the battery for 5 min to reset the computer. I thought that was a get off the phone answer so I unhooked the battery cleaned the post then hooked it all back up. Everything works like it should. It has been almost 2 months and still working.