I read that ur problem is with a Mitsubishi lancer, and not an f-150. or u r question reflects sumthing else. nun the less :mit lancer ac fan is governed by a thermal shut off. if u use it it will run, if not it will shutoff. NOW: f150?? relays r in the box under the dashboard driver side. chk fuses first,cuz relays r tough to git at.lol!
SOURCE: Blower for AC/Heater stopped working
hi
my heater blower has stopped working all together i have checked all the fuses but do not no where the relays are for the heater.
SOURCE: 2002 Ford Taurus blower fan only works on high
fords are notorius for faulty fan switches, you will need to get a new one, but it will probably fail in a year or two.
SOURCE: 2000 ford explorer fan blower only works intermittently
On ford vehicles the blower motor resistors are the most common problem when this happens.
SOURCE: 2000 expedition ac fan want stop running
well it seems to me that you've found the problem, the relay is stuck closed. looking at these wiring diagrams i have, fuse #23 supplys power to the relay. this circuit is hot at all times. so with the relay stuck, it would energize the motor. you can swap a relay of the same type with one from the same location. just be sure it has nothing to do with starting or running the car. most relays are identical. check the part number on the relay
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SOURCE: 2005 Ford Expedition heat/ac blower not working
I would start if you haven't already by checking the fuse. Below is a fuse layout diagram for your vehicle. The yellow arrow is pointing to the 40 amp fuse for the blower motor and the red arrow is pointing to the blower motor relay. If the fuse is good and having someone helping, while touching the relay with your finger have the other person turn the A/C fan on and see if you feel a click inside the relay. If you do not you may be dealing with a bad relay. You can also check to make sure you are getting power at the brown and yellow wire at the blower motor itself. Use a separate ground than the other wirw at the blower motor connector. You should have battery voltage there. If all is good so far you can put direct power and ground to the blower motor to see if it works and if it does you may be looking at the blow motor resister or the controller. I would need to know if you have a manual or automatic climate controlled system in prder to help further. This is all assuming you are talking about the front A/C system and not the rear or aux. A/C system. Hope this helps.....
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