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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 10-22-2014, 02:15 PM
steverodd steverodd is offline
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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.
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Old 10-23-2014, 09:18 AM
jr105 jr105 is offline
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Join Date: Jul 2005
Posts: 262
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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.
04 F150 STX
98 Corvette
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Old 10-23-2014, 09:18 AM

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