I just recently purchased an 05 f150, the seller said that they replaced the blower motor resistor but it still didn't work, I mistrusted him and picked one up for a salvage yard and it still doesn't work on any setting other than high, also noticed with the resistor even unplugged the blower motor still runs on high, pretty weird, is this normal? and does anyone have any other suggestions on how to repair this issue..i may be a girl but I am not afraid to get my hands dirty, lol

 

those resistors aren't that expensive and can be bought at any auto parts store.

 

I purchased a new one at a salvage yard, and it works the same as the old one, do you know if the blower motor would cause this?

 

the resistor that I picked up was new, do you think that the blower motor would cause this issue?

 

I suppose it's possible. It may have worn bearings and may not run until it gets maximum voltage. Just wild guessing.

 

Yes, that is normal. The resistor is bypassed completely when the switch is set to the highest speed.

No.

The ONLY things that can cause your symptom is a faulty resistor pack, a faulty EMTC control head, or an open ground between the resistor pack and its ground connection. I learned a very long time ago that just because an item is "new" does not mean that it is good. It's not KNOWN to be good until it's proven.

You really need a multimeter to effectively troubleshoot this. Guessing usually doesn't work all that well. Do you have one or can you get your hands on one? They're fairly inexpensive (<$20) for a basic one, even less if you have a Harbor Freight around.