If the fuse blows , it has a short to ground on the B+ side of thwe circuit . Don't know where you live ,so don't know what shops there charge ! Your probably looking at a least a hour diagnostic time . There are videos on youtube showing how to find a short . You would need to look at a wiring diagram to see what all that fuse supply's B+ voltage too. Then isolate the different circuits till the fuse doesn't blow . But if you haven't done electrical diagnostics before ?
Don't know where you got your info . The heater blower motor electrical B+ power comes from Fuse F 64 a 40 amp fuse . This goes right to the blower motor on the green with orange stripe wire , The black with red stripe wire goes to the switch for high speed . There is Splice 24 that ties into the black with red stripe wire. The splice 24 turns into a black with orange stripe wire . An this wire goes to the blower motor resistor . All the switch does is route the B+ voltage through the different resistors to ground .
Thermal resistor "usually" stops working is because of faulty fan speed switch ???? Totally not true , resistor assemblies fail because of the heat associated with dropping voltage across the resistors , That is why they put the resistor assembly in the air box . Air blows over to cool the resistors . The switch is nothing more then a way to direct different speeds to ground .
Rather then listening to other people ,why not learn the right way to test electrical circuits .
Electric Testing Techniques You Need to Know
Do you know what a wiring diagram is ?
http://www.bbbind.com/free_tsb.html Enter vehicle info . Under system click on HVAC , under subsystem click on heater . Click the search button , then on the link . Use a volt meter an test , don't guess !
I don't know the model year? Key on engine off, use a gage and check proper fuel pressure. Then with key off, see if pressure holds for a bit? If it drops like a rock, check for a fuel pressure leak. If the engine is hot and trying to flood for some reason, your going to have a tough time. Any applicable trouble codes? Check your coolant temp sensor, only if testing leads in that direction.
Smell of your crankcase oil dipstick, does it smell like gas?
Did you check to see if the inertia fuel cut off switch was tripped ? Do you know what this is on ford vehicles ? There are usually located in or behide the right side passenger kick panel , or in the trunk .
mondeo ,same as Xtype jag running gear but the software iam not sure about ,could be stop light switch but could be a sensor ,so you will not like what iam going to suggest and that is take it to your local ford garage and let them plug it in .
