I have a 2003 Ford F250. The fan switch doesn’t work on the first 2-3 settings - only on high. Can anyone suggest what would cause this and where I might look to try to fix the fan? Thanks.
Your resistor block is probably damaged. The resistor block is used for slower speeds, but by-passed for high speed. These are usually located near the blower fan. Should look like this: http://info.rockauto.com/getimage/getimage.php?imagekey=1285234&imageurl=http%3A//www.fordparts.com/PartImage.ashx%3Ffilename%3D4L3Z19A706AA-FRO%26dw%3D0%26dh%3D0%26type%3DJPGhttp://info.rockauto.com/getimage/getimage.php?imagekey=1191587&imageurl=http%3A//info.rockauto.com/Airtex/4P1367.jpg
Thank you! I’ll check that out.