Under the hood passen- ger side.next 2 the firewall there is small white vaccume hose that diseergrates.IT is in the wiring harness that comes through the fire wall.U can splice a small piece of vaccume hose 2 repair it.I believe it is a 1/8 inch hose-very small.If U run a new hose U won't have a problem anymore.the original hose will continue to go bad little by little.
My ac blows only in the defroster and not any of the other vents i have 98 ford windstar 3.8 v6
your switch cable might be broke you will have to remove your dash
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
heater core is shot and you have to get a new one
If it blows only out the defroster vents : then check for Vaccume leak Rick ASE L-1 Master TransMichigan.com
the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater
if there is a lot of snow or ice on these vents located at the bottom of the wind shield under the wipers that could be the problem if you live in a cold environment.
The 1984 Buick uses vacuum lines to change air flow from defroster to ac vents. Check the entire vacuum system for leaks.
It's either the thermostat or the heater controls.
The motor which blows air through the vents.
sounds like a vaccum line is off. Do you have an aftermarket stereo? I could also be the switch, but I would bet on a vaccum line, search for a diagram then go from there.
The little vents (or flaps) inside the heater system are stuck, broken, lost power (they're vacuum motors).
The doors are electric. You most likely have a broken door inside the heater box under the dash.
This means that you have either an issue with a vacuum line or one of the a/c - heater doors behind the dash is not working correctly and you need to start off at the a/c - heater controller to check that all positions are working...........
The first thing that you need to do is check for a vacuum leak for the a/c and heater system, this is a very common.............
I think your refering to the door in the heater housing that directs air to vents, floor or defroster vents, there is also a blend actuator that mixes heated or cooled air to give the correct temperature from the selector.
That is actually how the vehicle was designed. If you look at the selector knob for the vents you'll notice that the arrows pointing down and for the windshield are white and the vents for the dash are blue. Basically, you can defrost and warm your feet and that's it
Yes. The heater core provides the heat which blows out your vents. The heater core has engine coolant flowing through it (it is like a mini radiator) which creates the heat which warms the air that comes out your vents. If you have low coolant, there may be no coolant circulating through heater core, thus causing cold air to blow out vents.
Because it's not a defroster button! It's just the symbol for ventilating the air into the car. It shoudln't be called a defroster since defrosting is meant by heating up the coils that you see at the back of the car. I'm pretty no car has wires in the front!
Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
Check for a broken vacuum line by the battery. These lines get brittle and break with age.
If air blows from defroster only, the vacuum line to the blend door may be broken. You can access most of it under the hood.
Sounds like you have the beginnings of an a/c vacuum leak. Our Expedition did the same thing and eventually it defaulted to blowing out of only the heater vents, which is the default when things aren't routing properly.
Check for vacuum leak either under hood or under dash Check for bad vacuum actuator under dash Defrost is the default setting