Ford F150 Heater Fan Only Works On High

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.

Ford f150 heater fan only works on high.

4l3z 19a706 aa or napa part number. My fan was working on high only. This is a well documented problem and is caused by a failing blower motor resistor. I thought i d contribute a couple pictures.

Even kicks on when its a cooler day. All you need to do is to replace the resistor ford part number. 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.

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. My truck ia a 1999 f150 with manual heat ac 115 000. And yes the resistor is bypassed with the fan is on high. Fan kicks on about 30 seconds after vehicle is started and is extremely loud.

If your blower only operates on its highest speed chances are you have the series type of blower motor 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. Most commonly the fan will only run on the highest setting. In other designs the failure of 1 resistor means you lose only one speed.

However most car makers bypass the blower motor resistor completely when you move the fan speed switch to high. Also stays on when driving down the highway. I would like to thank everyone who contributes information. 2010 ford f150 radiator fan seems to be running on high more than it should.