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Hi Tony: I don't know what this vehicle this is but The first thing I would try to check would be the switch. Is power getting to it? Fuse? Is power coming out of the switch? The next thing to check would be the air gates in the defrost/vent routing. Could they be jammed, or could a linkage be detached?
Sounds like you have a treasure hunt for a project.
If there is no vacuum to the mode door control motor theheater/A/C system will default to "Defrost" If there is no air coming out the vents or floor - check to see if you have air blowing out the defrost vents. If there is air coming out the defrost, then the most likely cause of your problem is a broken or disconnected vacuum line that feeds the mode control switch. On your vehicle, the vacuum supply line connects to the brake booster hose under the hood. there is a check-valve on the line between the firewall and the brake booster that can fail and leak vacuum. if there is no problem with the vacuum supply line under the hood, then the most likely cause is a bad mode control switch. (switch leaking vacuum)
If there is no air coming out the defrost vents, but you can hear the blower motor running, there is most likely a resriction of airflow etween the blower motor and the air outlet plenum. I have seen A/C evaporators completely cloggedup that will not pass any air. I have also seen paers and napkins that have gotten sucked out of the glovebox area and into the "Recirc" air inlet. Another thing I have seen several times is nests made by mice or other small rodents in the blower motor housing.
From what I hear it is a vacuum line issue. Mine is doing the exact same thing. So, I am going to get a diagram and try checking the vacuum lines to see if any are loose or tore
I go under the dash and feel the air flowing out the floor and it is coming out of the defrost, also. I noticed under the drivers side today that air is flowing and there seems to be a gap in between a part under there. There was some material stuff I saw around the edge of it that sticky brown stuff and it sometimes before came out my vents all the time. Anyways, not sure if my air is just not sealed good to blow out the vents but it is something that happened not long ago and we've not done anything under our dash area.
Try checking the connecting hoses to the drivers side defroster vents, i also had the same problem. And i noticed it helped a little if you put in on re-circulate instead of fresh.
have the water pump checked out, i had a van that did the same thing and founf i had a bad water pump it fixed the problem.also check the blower motor to make sure its working right by tapping on it while you have the car running. the car will survive dont worry its going to be one of those two things im pretty sure.
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