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I go to the dealer spares department when I have a problem like this and have them show me a picture of the vent system in the car and I point to the bit that I want. Saves a lot of time and energy when you can point to the bit As to how to replace it the break down will also show the area and you can see if there are clips or what to get the bit replaced.
sounds to me the radiator fan assembly has quit working. relative easy fix for reasonably inexpensive price. can get new fan assembly from 1800radiators for about $65 and the whole assembly with new shroud for $110. just had same issue and it took less then 10 minutes to complete.
Expedition uses the same HVAC system as the Ford F150 pickup truck. The
Expedition is a little tricky though because you have to remove the center
console and floor heat distribution vent to access the actuator motor.
Once you remove the motor, you can examine the blend door axle for
cracks or breakage. This is a common fail mode on the Expedition.
HeaterTreater is the world's leading company for aftermarket blend door
fixes and has a product for the Expedition. Additional diagnostic
information and pictures are available on the Ford Expedition
HeaterTreater Ebay listing or the web site at www.heatertreater.net.
There is an inexpensive effective fix available that replaces the cheap
plastic door with steel that will outlast the vehicle.
This may be too late in posting. There are some great air fresheners that are a quick, inexpensive fix. The brand you want to look for is called Auto Expressions, Ventfresh airfresheners. Pep boys in my area, colorado springs, has a better choice than
autozone. They run about 3-4$ for a package of four. AE vent clips look better
in the vents than Refresh and other brands which have big round white head that
clash with the black.
ck to see if your vaccum hose if broken at the engine vaccum connection, it may have a vaccum hose split or a bad vaccum switch/actuator, if it has manual a/c, if it has electronic a/c then your mode actuator is not working.
does it blow through the defrost vent only when you switch to vent/floor or does it blow through defrost and vent/floor? is it a switch that is just electric or a manual lever that you slide? the manual type will have that problem if the diverter or the linkage behind the lever(in the dash behind the panel......may be able to access underneath) becomes broken or disconnected so that the air is diverted to defrost regardless where you move it.if you can get to it, you will see what is broken or maybe a fastenerr fell off.
If the clicking is only when you have moved the heater lever to the "hot" end and not when it is on the "cold" end, and it sounds like it is coming from under the middle of the dash, I would suggest that the problem is either the vent actuator or the vent connection to it. I hope for your sake the vent is not broken because that means not only does the central dash module have to come out to access the actuator, but you willl also have to remove the heater core to get to the vent section and replace it. I am in the process of doing that myself! If you tear it down to the actuator and remove it, get a flshlight and check the female end ( the vent ) and see if it has broken out on one or more sides. If it has you'll have to replace it because the actuator will just spin without moving the vent. Good luck!