2012 Ford Fiesta Blower Resistor Replacement 

Small world I guess. This video just helped me fix my daughter's 2011 Ford Fiesta which was also only working on speeds 3 and 4.

K

That's a super complicated question. Buuuut, if your resistor smells/looks or feels burned, replace it. If it works but then burns again or it didn't fix the problem at all then go buy a motor. Even then you cant be sure unless you check all your wiring and mechanicals. The motor could be seized or jammed so electrical readings wont tell you anything besides the motor is good. The motor might turn fine and wiring is ok but you have bad power to the unit or your control knob could be bad. You'd basically need to be a mechanic to know it's one or the other. Even then... look, if your symptoms match and you're not an expert, try the simplest, cheapest, thing. After that doesnt work you can tear the dash apart and replace the motor. And if that dont work then you were better off taking it to a shop.

that means its starting to fail.

Same happened to me, starting with 1, then 2 going out. 3 is barely blowing at this point, so I replaced the resistor as shown here and it's back to normal ^¬^

@@maruutah woo hoo!

I have literally identical symptoms

You wont be able to see much, it's mostly by feel. At 3:48 you can see the resistor pins when I move the connector. I didn't shine light directly on it because the reflection would glare out the camera. Good luck!

I take it back, My apologies...i was looking at wrong thing.. thanks for putting up