Ford F150 Heater Fan Only Works On High

I thought i d contribute a couple pictures.

Ford f150 heater fan only works on high.

Most commonly the fan will only run on the highest setting. My truck ia a 1999 f150 with manual heat ac 115 000. 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. Any obstructions or hindrances can blow the resistor quickly.

This is a well documented problem and is caused by a failing blower motor resistor. And yes the resistor is bypassed with the fan is on high. 4l3z 19a706 aa or napa part number. However most car makers bypass the blower motor resistor completely when you move the fan speed switch to high.

In other designs the failure of 1 resistor means you lose only one speed. This is the most common failure mode. Even kicks on when its a cooler day. All you need to do is to replace the resistor ford part number.

If your blower only operates on its highest speed chances are you have the series type of blower motor resistor. Also stays on when driving down the highway. Correcting the problem is straight forward and requires replacement of the small resistor. I would like to thank everyone who contributes information.

My fan was working on high only. This happens very often to ford pickup truck or suv. Articles how to s heater blower fan fix only high speed i did my search and found plenty of help. 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.