Heater problem
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New User
Joined: Sep 2008
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Heater problem
my truck developed a problem today with the Heating system,the Heater won't won't blow any heat unless the switch is on the High Setting.Anyone else have this problem,its a 03 F150 4WD?
Posting Guru
Joined: Oct 2005
Posts: 2,209
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From: Louisville, Kentucky
The blower motor resistor for the selection of you fan speeds is burnt out. It is located under the dash on the passenger side. Get down on the floor and look up under the dash on that side to find it. This is a pretty common failure mode of the heater system. Good luck! 
Thread Starter
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New User
Joined: Sep 2008
Posts: 11
Likes: 0
The blower motor resistor for the selection of you fan speeds is burnt out. It is located under the dash on the passenger side. Get down on the floor and look up under the dash on that side to find it. This is a pretty common failure mode of the heater system. Good luck!
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
I haven't had to replace one of these myself. My understanding is that you nearly have to stand on your head to see it up under there. LOL. Many others here have done it themselves so it shouldn't be too bad. Good luck!
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