I have a 2007 Sport Trac 4.0. My second speed on my blower does not work. Would it be a relay? Also where would be the location of this. Thanks, Rob C

 

Assuming you're talking about the HVAC blower motor (and not a supercharger), if only one speed doesn't work, and it's not high speed, it won't be a relay. That's probably either a blower motor resistor issue or a problem with the fan speed switch. A bad resistor would be the more common issue, although still not common for such a new vehicle.

-Rod