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Heater blower fan issue

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Westwildcat

CEG'er
Joined
Nov 9, 2011
Messages
240
Im my 99 svt I have no heater blower fan... no speeds work.. I checked the power at the wire that goes to the fan motor... and there is no power there... so its not the fan motor itself its something before it.. how do I go about troubleshooting this? Would it be a blown fuse? Is there a diagram somewhere that shows me what fuses are what? I could try that first?

Any help appreciated...

Thanks
 
Probably the resistor assembly that snaps onto the side of the blower housing. Could be the switch assembly also. Ford replaced some years under a recall.
 
How do I go about finding what the problem is? Short of taking car to a mechanic and paying them $100 an hour to figure it out....
 
Start with the simplest thing and check your fuses. If your fuses are all good, make sure you've got power to whichever fuse powers the blower motor. If you've got power there, check power at the resistor on the blower housing.
 
Yes, if careful the fuse panel can be snapped out to look at the big red, green wires going into the back, they supply the motor, or at least one of them does. The cross-sectional area there is too small and overheats to melt and not supply enough power to run the motor even if you check harness and get 12 volts there. They are before the fuse and therefor will not pop it.

When looking for junkyard replacement of part, almost every one I found had the trouble in one degree or another. Lucked out and found a car they had already changed that part on.
 
BradfordScales said:
Probably the resistor assembly that snaps onto the side of the blower housing. Could be the switch assembly also. Ford replaced some years under a recall.
Click to expand...

The resistor can NOT cause a "no blower" condition since it is completely bypassed in the HIGH position. It is the usual suspect in the "only high speed works" symptom.

You have several fuses, a relay or two, the mode switch, the speed switch, and, most importantly, the vehicle wiring and fusebox connections that are all suspects in addition to the blower motor itself. After checking the easy stuff, you'd need a meter/test lamp and the wiring diagram to dig deeper and see what's working and what's not.
 
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