Ford F150 Heater Fan Only Works On High

4l3z 19a706 aa or napa part number.

Ford f150 heater fan only works on high.

Also stays on when driving down the highway. Most commonly the fan will only run on the highest setting. Fan kicks on about 30 seconds after vehicle is started and is extremely loud. I would like to thank everyone who contributes information.

Even kicks on when its a cooler day. This happens very often to ford pickup truck or suv. My fan was working on high only. In other designs the failure of 1 resistor means you lose only one speed.

All you need to do is to replace the resistor ford part number. However most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. Correcting the problem is straight forward and requires replacement of the small resistor. And yes the resistor is bypassed with the fan is on high.

2010 ford f150 radiator fan seems to be running on high more than it should. Articles how to s heater blower fan fix only high speed i did my search and found plenty of help. The 2004 2014 ford f 150 with manual temperature and fan controls may have problems with the the blower motor only blowing air on certain settings. This is the most common failure mode.

I thought i d contribute a couple pictures. This is a well documented problem and is caused by a failing blower motor resistor. Any obstructions or hindrances can blow the resistor quickly. You should check and make sure the blower motor is working properly not jammed or any obstructions preventing the free movement of the blade fins.