Question about 2006 Ford F-250 Super Duty

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Heater fan will not shut off

Heater fan stays on when the off button is pushed runs in all settings and is not adjustable

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Sounds like the fan switch has went bad. This could also be a problem with the fan resistor relay which is what the the fan switch goes through before the power reaches the fan. More often than not, it's a one two punch. Take the switch out and check for continuity between ground and the other terminal on the back you will find that, no matter where you put it on has "power" constantly. That is a nogo switch. Unfortunately, I can't tell you the location of the fan switch resistor relay it's tucked behind the dash usually or in the engine compartment.

Posted on Nov 18, 2013

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