Blower motor not working

There are two different systems; and both use unnecessarily complicated computer controls. The fan is wired differently than on older systems. Twelve volts is applied directly to the fan motor from a "front fan relay". Check for that twelve volts on the black wire at the motor.

Do you have dual zone front heating?

If there's no 12 volts on the black wire, look for the "front fan relay" in the under-hood fuse box. Bypass that relay, then see if the fan motor runs. You can do that by removing the cover from the relay, then reinstalling it that way and squeezing the contact, or use a stretched-out paper clip or piece of wire to connect terminals 30 and 87 together in the socket.

Hooking a jumper wire between the fuse socket and battery is the same as jumping the two relay terminals 30 and 87 together. All this proves is that relay is not being turned on, and that is done by an unnecessarily-complicated computer circuit. It does prove the rest of the fan circuit is working.

Check for 12 volts on terminal 30 in the relay socket. It should be there all the time.

Which engine do you have, the 3.3L V-6 or the 2.4L four-cylinder?

There is no 12 volts being switched onto the line to the fan motor. That can be because there is no 12 volts feeding the relay or because the relay is not being switched on.

You're right about the grossly-over-complicated fuse box. That is a ridiculous Ford innovation that everyone else copied. It truly does replace simple, reliable switches with unreliable computer circuits.

Jump terminals 30 and 87 together right in the relay's socket. If the fan runs, there has to be 12 volts getting to terminal 30, and there's no need to look further. If the 12 volts is indeed missing on terminal 30 I'd be real surprised because the circuit that feeds the fan relay also feeds all the other functions. There would have to be a break inside the module, and that would be very uncommon.

Nope. Jump 30 to 87. That is connecting the two switch contact terminals. 85 and 86 are the control half of the relay, and is where I suspect we're going to find the problem.

Once you verify the high-current part of the circuit is working, where we go next depends on what I can find in my research of circuit operation. I prefer to follow wiring diagrams to the source of the problem, but when these over-complicated computer controls are added to what used to be common-sense circuits, there are no clear-cut tests that will provide useful information.

I'm in the middle of Wisconsin, so I know very well what working in cold is like.

If the fan runs, the next thing is to figure out why the relay is not being turned on. Terminal 86 should also have 12 volts all the time. The computer grounds terminal 85 to turn the relay on. The data buss wire is the only thing I can find that connects the heater control assembly to the Integrated Power Module. That means further testing requires a scanner.

The first step with the scanner is to access the heater control module and see if it shows it is sending a signal for "fan control" when any functions are selected. If it is sending that signal, the next step is to access the Integrated Power Module and look at the "Inputs / Outputs" to see if it is receiving and recognizing that signal. If it shows the signal is being received, but it's not turning on the relay, that IPM is suspect.

Nope. The only thing shown on the diagram is a box representing the computer circuitry that grounds the relay. You need the scanner to figure out if the heater controller is sending the "fan request" signal or the front module is not reacting to that request.

To bypass the computer controls, you can stick a thin wire into terminal 85, then install the relay. Use a jumper wire to ground 85, and the fan will work. The jumper wire is taking the place of the computer controls. Nothing else will be damaged, but I don't know what the ramifications are of doing that as far as setting diagnostic fault codes.

Be careful to not use such a fat wire as to spread the terminal in the socket. That can cause intermittent problems later.