Ford F150 Heater Fan Only Works On High

Most commonly the fan will only run on the highest setting.

Ford f150 heater fan only works on high.

This happens very often to ford pickup truck or suv. I thought i d contribute a couple pictures. In other designs the failure of 1 resistor means you lose only one speed. My fan was working on high only.

I would like to thank everyone who contributes information. 2010 ford f150 radiator fan seems to be running on high more than it should. And yes the resistor is bypassed with the fan is on high. However most car makers bypass the blower motor resistor completely when you move the fan speed switch to high.

4l3z 19a706 aa or napa part number. Articles how to s heater blower fan fix only high speed i did my search and found plenty of help. This video highlights a common issue found on 2011 ford f150 pickups with automatic hvac systems when the blower fan speed becomes stuck on high speed. This is the most common failure mode.

Correcting the problem is straight forward and requires replacement of the small resistor. 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. If your blower only operates on its highest speed chances are you have the series type of blower motor resistor. Even kicks on when its a cooler day.

Fan kicks on about 30 seconds after vehicle is started and is extremely loud. Any obstructions or hindrances can blow the resistor quickly. Also stays on when driving down the highway. This is a well documented problem and is caused by a failing blower motor resistor.