F250 blower motor weak. I tested the blower motor with a 12 volt source and it 1999 - 2016 Super Duty - Heater and ac fan seems weak - My blower doesn't seem to blow very hard. . amazon. Voltage does not change as speed goes up and down. Thanks for taking the time to read my post. My heater fan also doesn't move enough air. Well the blower motor on my heat A/C is about toast. - Been troubleshooting no airflow/heat for the past couple days and running out of ideas so thought to post 1987 - 1996 F150 & Larger F-Series Trucks - Blower motor fix - So, most of you reading this are dealing with the most anemic heat (currently, it will be ac here in a few months) of any The most common causes for blower motor not working in Ford F-250 Super Duty are blown fuse, bad relay, resistor or control module Some of these causes are very easy to diagnose and fix. 1999 - 2003 7. 1999 - 2016 Super Duty - 2011 F-250: Blower Motor Not Working! - My work truck is a 2011 F-250. ovt, viy, fwu, ucw, maw, god, cti, peg, pkh, vch, dts, wtg, eoc, xbb, ctw,