I have a 99 Ford F250 super duty. When I turn on the fan to the heater and AC I can hear air moving in to the vents. No air moves out of the vent on any setting. It is like all vents are closed. what could be the problem. I have replaced the switch. I check the blower motor.
You have a vacuum leak causing your vents to switch from dash to defrost.
perhaps because the engine running heats coolant that cycles through the heater core and has air blowing across the aluminum to exchange the heat into the air that is forced through the vents
Blower motor working? Could be bad vacuum motor or connection could be plugged evaporator
If the air vents of the Chevy trailblazer 2004 are not blowing air, have the fuel pump checked.
The most common cause of an air conditioner not blowing air is a plugged filter. Be sure your filter is clean.
Car not blowing air or heat
If central air conditioner turns on but is not blowing through the vents, check the filter. If it is dirty, change it. Change the thermostat into cool, this will defrost the air conditioner.
this one is easy your switch the controls the vents is not working there is a flap the closes the defrost vents so that it goes through the other vents or there is a vacumn line that is controlled by the switch, and its leaking. The vacumn line is usually on the engine side of the firewall. It is a very small plastic tube comming out of the middle of the firewall at the top and it connects to a junction with other vacumn lines. See if any of them are disconnected.
Air still in the vents or freshly-shut coils still contain heat for a short amount of time after turning off the power. Also, it could take a short amount of time for the fans blowing the air to slow down, even after cutting power.
replace the temperature switch it i sthe one on the right of three in the middle of dash I have same problem on my 98 it took me like 6 hours to get to the problem but it worth
what i am assuming is being talked about is that when you go to turn on the heat in a Seville, heat will only be produced out of one side of vents. there are a number of valves in a Seville which control wether the air that is coming out of the vents in hot or cold. in a Seville there are a pair of these valves one for the passenger side air, and one for the driver side air. the reason why only one side of the car is blowing hot air is because one of these valves has gotten stuck in the "cold air" position and needs to be replaced. the same thing happened on my car but the drivers side was the one not blowing heat.
Check blower motor fuse Blower motor resistor pack? Fan switch? Selector switch? ---- Is the Blower Motor Working? I'm not sure if the question is that the blower motor is working and "no air is blowing thru the vents'! If the blower is working and no air is blowing thru the vents then you could have a broken Recirculation Door. That is another common heating problem with the 99/04 Jeep GC. The recirc door brakes and falls down blocking the blower which will reduce or block the air flow completely. Normally the dashboard would have to be removed to replace the broken recirculation door. See the Link below for a NO Dash Removalrecirculation door fix. ----