It comes on when it wants! I pulled the fan motor and it works in all settings. The passenger dash gurgles when I accelerate and i suspect rain may have infiltrated and I must pull the dash. Not looking forward to that. Are there vacuum controls or are they all electric? Any tests for blend door oop?
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Re: Intermittant fan operation
The system is all electric with no vaccum controls. what i believe is the problem is you have a bad resister which is mounted near the fan motor with a 2 wire lead to it replace this and the problem should be solved
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If the blower fan is not operational,check fuses. If the blower fan was working but all fan speeds were not working, possible fan motor resistor. You can try slapping on the botttom of the passenger dash area with the fan motor in the on position with the palm of your hand to see if that will activate the motor. If it does, the motor will need replacement.
Find the fan motor and kick or hit it and see if it comes on. Sometimes it does, the brushes in the motor wear out and it stops. If that does not work, check the fuses, if they are ok, get a volt meter and pull the connection to the motor that you kicked that is usually under the passenger side dash and see if you have any voltage to it when you go through the low med hi settings.
So the fan only comes on when it's in the highest setting?
If so the problem is likely your blower motor resistor. It is responsible for dropping voltage which determines the other fan speeds. The blower motor resitor is located under the passenger side of the dash near the blower motor and is readily available from most parts stores or your local dealer.
For more info on blower motor operation check out my fixya tip
The passenger side is where the fan is located inside the engine compartment by the firewall...check to see that the violet wire that goes to the motor is firmly attached and also check to see that the ground wire is attached to the motor case...there is also the possibility that the heater resistor is intermittant...this device has 4 wires on it and is located just to the right of the fan motor...it looks like a plate with 2 screws and has a 4 wire connector on it...they can become intermittant...you can also check to see that the relay(also mounted near the fan and looks like a metal box with 4-5 wires on it) is properly plugged in and functioning
I dont know what these other guys are saying..I think they snif the glue!!! YOUR BLOWER FAN ASSEMBLY CAN EASILY BE REMOVED !!
1. Remove the wire
2.Find the "tab on the housing and pull it down while rotating the fan housing counter clockwise. This will remove the fan assembly. Plage 12 volts on the contacts to test the motor. If it works then the resister pack is blown. On the fan housing (near firewall ) you will see a plug going into a square looking box with a screw in it. Remove the wire then remove the screw to remove the resistor pack.. A new resistor pack is around 20 dollars at a ford dealer. Hope thie "FREE" info helps!
It has been a long time since I've replaced one of those. From what I remember you don't have to go through pulling the heater box out. You do need to remove the glove box assembly. Look up under the passenger side of the dash. If you see the bulge of the motor/cover hanging straight down then remove the cover and the motor will be there. If you don't see that then te motor is mounted horizonally. If that is the case then the fresh air door assembly will need to be removed and it is behind that.
Here is a quick check to see if the motor is bad. Thump the bottom of the heater box by the passenger's feet. if the motor comes alive or makes noise then it is bad. Also check the fuse and make sure that it doesn't work on any speed. (the resistor would prevent operation on only one speed or more but generally not all speeds)
most likely the blower motor squirrel cage hit the fan housing or the motor has a damaged bearing from the impact, the noise is coming from the fan which is on the passenger side, pull the fan assembly out and see if the blower cage is damaged, if it spins true then replace the blower motor, not a very hard job.