HELP I have a 07 F650 crewcab with a Cat engine. The air-condition and heater fan work intermittently no rime or reason to it, be driving down the road and it quites, then maybe a few hours later and it will start. A few days ago my wife turned on the key and the fan was working and then yesterday she turned the key on and it wasn't. When I bought it I watched them replace the fan and it worked for a few hundred mile then stopped, for the rest of the trip it was on and off. I replace the resistor and spliced on a new electrical connector, but still have the same problems.... any ideas..... David

 

brushes in motor might be wearing out... or springs for brushes overheated...


just replace blower motor.. but check wires AT MOTOR first...

 

Thanks Chuck's First Ford. Put a new fan motor in but didn't correct the problem