1999 Windstar clicking sound no matter which way vent switch
Under the center of dash this clicking sound comes - only cool air coming in front or rear - both fans wroking, but NO HEAT
Temp guage shows normal after engine warmed.
blend door actuator doe not seem to be problem.
It seems the blend door may have something preventing its movement. I cannot find a illustration of where or awhat it looks like - how to access.
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Depends on what is clicking. The engine vac opens blend doors under the dash. It could be one of the vac pots or a blend door is sticking. Normally the hissing noise means you have a leak, but a leak usually does not fix itself.
If this noise is a clicking sound and is coming from the front center of the dash, then it may be the blender door motor which will require removal of the dash to replace it. It will keep the door from switching from heat to a/c. Does the odor smell like you have a freon leak in your a/c evaporator core or does it smell like a rat stuck in your heater and a/c ducts?
Check the plenum door motors (vacuum controllers). When you move control you should see each of them move. the one that does not respond is the one that isn't working. Check hose that feeds it as well if no vacuum there switch control is bad.)
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!