What I would do is pull the fan blower motor speed switch, plug the wires back into it while you're holding it in your hand, run the car, and check with a multitester and see if you are getting voltage at the switch. Should be something like:
High=12-14 volts
MHi=8-10 volts
MLo=4-6 volts
Low=2-4 volts
OFF=no voltage
If you get voltage but the fan still doesn't work, then it's either a bad ground, or the motor is bad. If you can access the blower motor wire connections(sometimes its easier to try this with it removed from the vehicle), then you could try jumping the blower motor at the wiring connection with a known good 12 volt source, and if you STILL can't get the motor to spin then it's seized up or it's just a bad motor. If you have the motor removed, try spinning the squirrel cage by hand. Is it stiff? Seized? Probably need a new one if it doesn't spin freely by hand.
Hope this helps!
SOURCE: heater control wont heat. AC and fan works fine
The heater core was plugged and took 8 flushes to clean it . Would clean it would stop again. Have heat now .
Thank you everyone for helping.
SOURCE: fan quit on 87 celebrity, heat ac, etc.. fuse ok ????
Hi
Check for bad connection at heater resistor or try tapping heater motor lightly
with ignition switch on and heater switch on. Could be heater switch connection.
SOURCE: ac/fan wont kick on
There's a fan speed control module on the firewall under the hood. Three screws. Go to your FORD dealer and buy one from their parts department (under $50) and when you have the part in your hand you'll re3cognize the one on the firewall. Takes five minues but the mercury dealer wanted to charge me $600 as the 'Book Rate'. Screw then! It's an easy fix - you can do it with a screwdriver.
SOURCE: MY 2004 CHEVY TAHOE AC AND HEATER FAN DOES NOT
It may be the heater fan motor or connection to it .
I have replaced a lot of these that required a new connector to make then work....as the original connector semi melted at the fan motor.
SOURCE: control panel on dash that
I have same problem, have to put small heater in truck and plug in for cab and windows to defrost. Once on hiway i'm fine because heat is stuck on no fan though. City driving gets very cold and windows frost. Need wiring diagram.
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