Heater problem 04 f150
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Senior User
Joined: Jun 2004
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Heater problem 04 f150
Ok new problem, my heater, air conditioner, defroster, as of 2 weeks ago stopped working on setting #1, then last week, stopped working on settings 1 and 2, and just today stopped working on # 3 as well, so heater/defroster, and a/c now only work on high. I assume it's only a matter of time before that quits too. Thoughts on this? Maybe just the switch? Temperature switch works fine, just speed of the fan ,either all or nothing 
More Turbo
Joined: Jul 2005
Posts: 591
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From: Groton, MA
It's probably the blower resistor network that is bad. It is a module under the dash behind the glovebox if the F150 is like my other cars. The glovebox will swing down if you push the sides in to get it by the stops.
Freshman User
Joined: Sep 2011
Posts: 39
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This is because on hi, the resistor is bypassed. 10-20 minute job to change one and hear they are about 35 bucks to buy.
About a zillion "how to's" on the forums on where it is and how to replace it.
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