My husband and I fixed ours on a 1985corolla. There is a blower motor which was located under/ behind glove compartment, we bought a used one from a junk yard switched then and we had our vents back.
the ducts can not be hooked up for the vents to work
The most likely cause is the hoses to the center vents coming loose. Feel under the dash to see if cold air is blowing, and look to see if you can see the back of the vents to insure the hoses are connected.
Your most likely issue is a bad hvac control switch. On older cars, this was operated by vacumm pressure, but on a 2002, it is all electrical. It may be that you need to replace the whole control unit.
The selector mechanism needs repair or the doors inside the vent are jammed.
Most temp blend doors have an electric actuator. The defroster, dash vents and floor vents are usually run by vacuum.
When there is a problem with the vent system it dfaults to the defrost setting. Sounds like you have a problem in the doors that direct the air flow.
most of these door systems are vacuum controlled...but a pencil or object stuck internally can also be the cause, and not often easy to fix...for the vacuum system you can find specs and routing at the local library... check all the vacuum lines on the engine, and listen for vacuum hissing under the dash...good luck..:)
The a/c - heater controller is out...........
The vent tube has become disconnected under the dash. You'll need to remove the stereo and heater control panel to gain access. Reconnect the hose and put everything back together.
it would depend on the year of the accord. Does the defrost work or the heat in the floor work if so the line for swapping control is either broke or has come off. you can check the lower side by looking in the drivers side under the dash.
either faulty switch on dash, acutators inside the dash, or broken doors or plastic inside of dash.... common problem on the 2002-2004 or 2005 there was a total dash replacement kit it change out the broken plastic pieces inside the dash
Cars with an Automatic Temperature Control system have a thermometer in the dash console with little vents to allow air to come in. The thermometer temperature reading is then used to control the fan speed and also the air mix (temperature) to match the temperature selected....
Don't know what vehicle you have but, sounds like the duct work came apart for the middle vents.
You need to look under your dash and make sure all the heater vent tubing is still connected and if so there is a flap located about the center of the dash that transfers the flow of air from the dash to the vents it could be hung in one position,hope this helps,Ricky.If that doesnt work then you need a new blower motor
I would look for a Vacuum leak possibly under hood. Does your Cruise control work?
if the fan motor isn't working, the fan motor has likely got a loose connection of some sort. if the fan does work but the reguler vents don't you might have something blocking them.
It starts with your blower which is usually located on passenger side under dash then blows thru a sealed vent thru your heater core then from there goes thru almost like a sealed box that controls which vents it goes to depending on what your setting are on.
If the floor and defrost vents are both operating and you can't change air flow to any other vents, the dash control unit does not have a vacuum source. This vacuum comes into the cabin from under the hood. Look for a black plastic line coming through the firewall near the blower motor on the passenger side. This line should attach to a vacuum canister. The canister is generally round black plastic. What usually happens is the vacuum hose gets knocked off or the plastic line may break.
the vents work because of the heat which can make the hot air balloon go up
A fan in the engine brings air in then the coolant or the heater cools or heats it then it comes up the pipes and out the vents. You can adjust the temperature with the buttons on the dash board.
Some manufacturers use real burled walnut for the dash panel bezel to mount the gauges in as well as the rest of the dash board trim work, and the console usually
The Heating/ ventilation systems in cars are large structures throughout the dash board, that have many channels of which air can flow through. When you use your face vents, the air is blowing from the upper vent channels. If you use the windshield defroster, the air comes from the very same upper channels, the channels just switch. They have a divider that blocks airflow one way or another. Very much like train tracks, when you change the settings with the switches, the airflow changes because the divider has moved. Therefore you cannot use both at once. The only reason why you can use the foot vents, and face vents at the same time, is because they have a divider that splits the channel that they share, you can use face vents (full force), foot vents (full force) or both split (half force). The Defroster is made to work fast, so if you use the face, and defroster vents at the same time, the defroster would be half as effective. This is why you cant use them both at the same time.
Try pulling the heater ducting apart near the fan box, found under the dash passenger side. It is probably full of leaves etc. Remove all debris and reassemble.if you are trying to get the dash vents to blow hot air they were not designed to work that way they only blow hot air threw defroster,foot and in front of shifter and outter dash vents i replaced the entire blower motor assembly than called suzuki to ask why the center dash vents dont blow hot air he informed me that this is a common complaint but they were never designed to blow hot air
Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch Defrost is the default setting for this system
is blower motor runing? does it work in defrost? if so solector lever may not be functioning. vaccum problem or mechanical on head unit.